List of Teenage Mutant Ninja Turtles supporting characters

The following is a list of supporting characters of the Teenage Mutant Ninja Turtles.

Family

• Splinter- the mutant rat sensei and adoptive father of the Ninja Turtles, trained in Ninjutsu by his owner and master, Hamato Yoshi, in Japan.
• April O'Neil- a plucky human companion of the Ninja Turtles, who she met when they saved her from a squadron of MOUSERS chasing her down the sewers. She embarked on many of the Turtles' adventures and aids them by doing the work in public while the Turtles cannot.
• Casey Jones- a hockey-masked vigilante armed with an assortment of sporting goods that he carries in a golf bag, whose caring family used to own an amazing shop until the Purple Dragons broke in and burned it to the ground, killing his father and taking his mother and sister hostage. Beaten savagely by Hun and dedicating himself to fighting crime, he became a close ally of the Ninja Turtles, who he met after having a fight with Raphael. Arrogant and aggressive, he is shown the error of his ways and continues to fight alongside the Turtles throughout their adventures.

Mutated Monsters

Mighty Mutanimals

• Dreadmon- was a mutant red wolf and deceased ally of the Ninja Turtles.
• Jagwar - a mutant jaguar and deceased ally of the Ninja Turtles.
• Leatherhead- a mutant American alligator and hot-headead ally of the Ninja Turtles.
• Mondo Gecko - a mutant green gecko and one of the first teenage allies of the Ninja Turtles, who shares a close relationship with Michelangelo.
• Ray Fillet (originally called Man Ray) - a mutant manta ray and small-time marine life ally of the Ninja Turtles on various occasions. As Jack Finney, a human marine biologist who worked the Boroughs Aquarium in New Jersey, he was scuba-diving into a pipe on Bayview Beach one night when a barrel of mutagen was accidentally spilled into the pipe by Bebop and Rocksteady, polluting the water and washing him into the river. Thus, Finney mutated into a humanoid manta ray due to holding one of the aquarium's manta rays during a marine biology show and began taking action to stop Shredder's Fourth of July scheme. After saving the Ninja Turtles from a torpedo launched by the Foot Clan from their submarine, Ray defeated Shredder in a fist-fight underwater and dragged him to shore. However, Shredder saw the opportunity to kick sand in his face as a means of making his escape. Later on, Ray continued to help the Turtles on occasional missions and was recruited as a member of the Mighty Mutanimals.
• Wingnut and Screwloose - an alien or mutant bat and mosquito who are both enemies or allies of the Ninja Turtles.As the only living members of two alien species from the Dimension X planet Dexion V, their very homeworld was eventually wiped clean of life due to an invasion made by Krang, leaving the Wingnut and Screwloose homeless in the dimension's stump area. The duo later found their way to Earth, where they came in conflict with the Ninja Turtles after attacking and destroying their blimp (which was hovering over the New York City skyline in search of Krang). Learning that the only reason the duo attacked was because the thought they were working for Krang, the Turtles teamed up with Wingnut and Screwloose in a battle against Krang and the Foot Clan for the Turnstone, thus gaining the duo's trust for earthly mutants and granting them two memberships in the Mighty Mutanimals.
• Slash- an alien or mutant snapping turtle and either an enemy, ally or frenemy of the Ninja Turtles.As part of a snapping turtle alien species on a tropical Dimension X planet, Shlash's home world was eventually destroyed by alien invaders, leaving him the only homeless survivor in his kind. He was later found by Krang, who made a deal with him to find his way back to Earth and in return, Slash came under the former's leadership and kept the Ninja Turtles busy while Krang sought to posses Shredder's body, but to no avail. Slash's rampage caught the attention of the Mighty Mutanimals, who captured him and brought him to their island. With Leatherhead's help, Slash was able to control his violent spree and informed that he would be allowed to stay in a grove of lush palm trees he so loved. Grateful, he went on to become a member of the Mutanimals, ultimately sacrificing himself later to save the Turtles.
• Metalhead - suffers a bizarre encounter with mutagen that exposes his internal organs and resides in a special robotic suit.
• Ninjara - real name is Umeko, but for reasons that were never fully revealed she goes by the name "Ninjara." She is generally accepted as Raphael's girlfriend in the TMNT Archie comic series. While Splinter first thought she was an "atomic child", she was actually once part of an ancient race of humanoid foxes living on a hidden island off the coast of Japan. She ended up becoming a thief and assassin for the villainous dog-man Chien Kahn, but then had a change of heart when she met the Turtles, and fell in love with Raphael. She helped out on many missions, from the Far and the Middle East to Dimension X. Her family life was explored more in detail when her younger brother managed to track her down and convince her to come back home. The Turtles discovered the island was hidden by fog banks, but despite this, it had been discovered by an opportunistic, greedy hunter. She was a powerful member of the team from issue #29 until issue #70, when the relationship between her and Raphael came to an end due to personal differences.
• Al Falqa - a mutant falcon from an unnamed city in Saudi Arabia who is exclusive to the "Teenage Mutant Ninja Turtles Adventures" comics. Al Falqua encounters the Turtles when they were travelling in Saudi Arabia. They helped Al Falqua protect the mysterious Black Stone which was about to be stolen by Shredder and Verminator-X.

Punk Frogs

• Attila the Frog - a member of the Punk Frogs. He is named after Attila the Hun.
• Genghis Frog - a member of the Punk Frogs. He is named after Genghis Khan.

Others

• Renet - a rather reluctant, spoiled, and impulsive teenager whose parents, also denizens of the 79th Level, hoped that apprenticing her to Lord Simultaneous would help her develop some kind of common sense. Curious and impatient as she was, she did not care very much for studying. Renet first met the Turtles fooling around, when one day out of boredom she snatched her master's Time Scepter and was caught by him. She replied immediately and time-traveled off with Lord Simultaneous’ Sceptre of the Sands of Time to Earth - more specifically to 1986 New York City. Renet and the Turtles became friends, but Simultaneous appeared and sent Renet into a panic. Fleeing Simultaneous further, she and the Turtles went to 1406 A.D., straight into a castle siege. The castle belonged to the dark mage Savanti Romero, a former, but exiled student of Simultaneous, and the besiegers were the soldiers of Cerebus, who was after some scrolls, that Romero had stolen. Romero also managed to grab the Time Scepter, and the Turtles and Renet had to contend with Cerebus' help to attack the castle and get the Sceptre back from Savanti Romero. The force was no match for Romero's magic. Before it came to the worst, Simultaneous appeared. Romero attacked Lord Simultaneous who took the Time Scepter again and cast Savanti into prehistoric times. He handed the scrolls to Cerebus, sent the Turtles back again to their time, and sent Renet to wipe dust in his huge library to. Later, she assists the Turtles in defeating Savanti Romero in prehistory when Romero plans to alter the Earths orbit and prevent the asteroid impact that wiped out the dinosaurs, meaning humanity, and mutant Turtles, will never exist. After defeating Romero, the group is stranded in prehistory for several months after the Scepter is lost in the ocean, but it is eventually recovered. Renee makes a third appearance saving the Turtles from Romero's demonic bride, Juliet Romero. This time she appears as a deity-like woman with full control over her time manipulating powers.
• Tattoo - a sumo wrestler whose tattoos can be used as weapons.

Villains

Foot Clan

• The Shredder - the leader of the Foot Clan and arch-enemy of the Ninja Turtles. Originally born in feudal Japan as Oroku Saki, he grew up alongside his older brother Nagi, a Foot Clan ninjutsu master who was killed in a feud against fellow ninjutsu master Hamato Yoshi over the love of a young woman named Tang Shen, resulting in Yoshi fleeing with Shen to America. Angry over his brother's death, Saki took Nagi's place in the Foot Clan to be trained as a ninja, quickly becoming one of their deadliest warriors while rising up the ranks and was chosen to lead the Foot's American branch. Operating in New York under the name of "The Shredder", Saki used the opportunity to avenge his brother by killing Yoshi and Shen, as well as having The Foot participate in variety of criminal activities under his leadership, including drug smuggling, arms running, and assassination. Fifteen years later, Shredder was challenged by the Ninja Turtles, who were trained as ninjas by Yoshi's pet rat, Splinter, to avenge his master. After a lengthy rooftop battle where Shredder seemed to be winning, Leonardo managed to plunge his sword through Shredder's torso. Defeated, Shredder was offered the opportunity to commit seppuku, but he refused and detonated a thermite grenade in an attempt to destroy them. However, in the last second, Donatello used his bo to knock Shredder off the building to his death, accomplishing his and the other three Turtles' mission as they returned home, having faded away into the night as full-fledged ninjas.
• Karai - a high-ranking member of the Foot Clan employed as Shredder's second-in-command and both an ally and enemy of the Ninja Turtles, as well as Leonardo's part-time love interest, which earning her a petty rivalry between her and Raphael.
• Kitsune - an ancient Japanese witch who is allied with the Shredder.

Scientist

• Baxter Stockman - a mad scientist and human enemy of the Ninja Turtles, becoming employed by Shredder in most incarnations. After creating the MOUSERS, with April O'Neil as his computer programmer, Stockman used them to commit strange bank robberies by allowing them to dig small tunnels leading into the vaults. April found out and tried to escape through the MOUSER factory elevator, but Stockman sent the elevator (with her still in it) down to the sewer level, where a squadron of MOUSERS were waiting to capture her. The Ninja Turtles saved her and successfully infiltrated the factory, stopping Stockman and leaving him in police custody. However, he escaped some time later and began using technology from DARPA to build a robot body for him to install his own brain into, making him a cyborg. Stockman tried getting revenge on the Turtles, but his new body was electrocuted and seemingly destroyed. Only his glasses remained.

Dimension X

• Krang - an alien warlord that comes from Dimension X in several incarnations of the series, while the 2012 cartoon series featured them as a race-here called the Kraang-who sought to conquer Earth for use as a colony world.
• Bebop and Rocksteady - a mutant warthog and black rhinoceros employed by Shredder and enemies of the Ninja Turtles. As two human punks from a street gang which was documented to have connections with the Foot Clan, Bebop and Rocksteady were mutated by Shredder into a humanoid warthog and black rhino due to petting a warthog and black rhino that the Foot were keeping in their lair's basement. In time, their animals sides eventually surfaced when dreaming and longing for the "old days" as a regular warthog and rhino in the wild. But this didn't work out for them when facing the Ninja Turtles, and as a result, Shredder banished them to an Eden World in Dimension X. They simply enjoyed their stay there, but returned to Earth with Krang, Amtrax and Bellybomb to resume their service to Shredder and battles against the Turtles.
• Tokka and Rahzar - a mutant alligator snapping turtle and gray wolf employed by Shredder and enemies of the Ninja Turtles. As a snapping turtle and gray wolf abducted from the Bronx Zoo by the Foot Clan, Tokka and Rahzar were mutated into more intelligent humanoid forms by kidnapped TCRI professor Jordan Perry under Shredder's orders, but during the process, Perry secretly altered the mutagen with the DNA of human children. This eventually gave the duo childish personalities, thus humiliating Shredder by thinking the word "master" meant "mama". However, Perry had sympathy for them and showed Shredder their full obedience, thus convincing to keep them around. The duo even proved to be more than a match for the Ninja Turtles, and after failing to stop them from rescuing Perry and causing destruction around the city, Tokka and Rahzar had the Foot deliver the Turtles a message telling them to meet the duo at a construction site near the docks for a re-match. Unfortunately, Perry had prepared a retro-mutagen for the Turtles to use, which retro-mutated both Tokka and Rahzar after a brief battle. The fate that followed the duo's retro-mutation remained unknown, but it's most likely that they could've been carted back to the zoo.

Purple Dragons

Main article: Purple Dragons

Other Villains

• Rat King - a more enigmatic enemy or even ally of the Ninja Turtles, with an apparent telepathic influence over rats. As a scarred and heavily-bandaged patient at a local hospital, the unnamed man who would later be known as the Rat King was chosen to take the place of a member of a group of beings, each with jurisdiction over a different animal species, known as the Pantheons (the one with jurisdiction over rats). Eventually going renegade on them, he resided in a swamp for several months before venturing to a nearby abandoned industrial park and using it as a shelter for the oncoming winter. However, it was there that he happened upon the Ninja Turtles and Casey Jones and, believing them to be other "monsters" who wish to take his territory (though they were actually there to train), Rat King stalked them around the park, eventually capturing Michelangelo and trying to feed him to the rats in the process. Fortunately, Michelangelo later escaped, and Rat King was defeated in a duel by Leonardo, who knocked him off balance and sent him plummeting into the bowels of a silo. Sometime later, Splinter journeyed to the silo and began having visions of Rat King appearing before him as a demonic rat-like entity. Telling Splinter to devour a rat to regain his strength, Rat King also stated that he has been waiting for him to come for a long time. However, when Splinter went down into the silo two months later, all he saw (much to his surprise) was Rat King's decaying corpse.
• Agent John Bishop - the leader of the Earth Protection Force, a group dedicated to protecting Earth from extraterrestrial attack, in the 2003 animated series, voiced by David Zen Mansley. Originally a soldier in the civil war, he was abducted by aliens, which embittered him towards extraterrestrials and led him to start the EPF. Through unknown means-possibly the use of clones of himself created using alien technology-Bishop survived into modern times, and first came into conflict with the turtles when the D'Hoonib Federation and the Triceraton Republic brought their war to Earth. Having forged an alliance with the Federation, Bishop helped them secure the Fugitoid Professor Honeycutt in exchange for having the Turtles to examine. Bishop had previously captured and experimented upon the Turtles' friend Leatherhead, who had previously been thought deceased, and in examining him and the Turtles found their genetic mutations to hold great promise for his never-ending war with aliens. The Turtles and Leatherhead managed to escape his clutches and fought him, but Bishop's abilities proved impressive enough to enable his escape as well. Bishop would clash with the Turtles several times, notably kidnapping Shredder's adopted daughter Karai and Master Splinter, whose mutated rodent DNA proved to be the missing piece Bishop needed to finish his Slayer Project. The Slayers, genetically enhanced clones of Bishop himself, were intended to infiltrate the human populace and weed out aliens in disguise, with little regard for any innocents who might be innocently claimed. However, the Turtles managed to destroy the Slayer project, with the only remaining specimen going renegade and reemerging as the Rat King.

The Turtles would engage Bishop on a number of future occasions, notably as a result of a faked alien invasion and the resulting genetic mutations that swept across New York.

• Darius Dun - a criminal weapons dealer whom the Turtles often contend with due to his dealings with their foes. Darius first appeared in Fast Forward as Cody Jones' uncle and the interim CEO of O'Neal Tech, the company Cody inherited from his parents. Darius acts as Cody's legal guardian, but secretly uses his position to manipulate Cody and O'Neal Tech's resources for his own agendas. The arrival of the Turtles hindered his plans, and he set out to eliminate them so that he would be free to continue unhindered. However, he eventually revealed his true nature and was forced to go on the run, but continued to seek revenge on the Turtles and Cody with his weapons technology and the Dark Turtles, evil clones of the four heroic mutants.

A new version of Darius later appeared in the present day IDW Comics storyline, where he funded the Street Phantoms gang and provided them with their technology.

• Street Phantoms - a gang of criminals notable for wearing cloaks that enable them to phase through solid matter in order to commit crimes. They first appeared in the Fast Forward series under the leadership of Jammerhead, a cyborg who was always trying to score the biggest heist that he could. This led him to employ high-tech upgrades such as the Bodyjacker, which enabled him to take over the bodies of others using a robotic sphere, and an upgrade that allowed him to emulate the fighting styles of the greatest martial artists. However, on every occasion the Turtles managed to turn his technology against him, landing him in prison time and time again.

The Street Phantoms later appeared in the IDW comics as a present day street gang with Darius Dun as their benefactor.

• Savanti Romero - A satyr-like demon the Turtles originally encountered during a crossover storyline with Cerebus The Aardvark. He was banished into the prehistoric past, only to once again attempt to destroy the Turtles by preventing the extinction of the dinosaurs, which would have prevented humanity, and by extension the Turtles, from existing. He is defeated when a bolt of cosmic energy fries him, though he would return once again. His wife Juliet Romero once attempted to avenge him, believing him dead.

Other Mutants

The following characters are mutant creatures that appeared in the different TV series, comics, action figures, and video games:

• Ace Duck - was once a test pilot named Ace Conrad when he was caught in Krang's transport beam and cross-fused with a duck. Ace was later saved by the Teenage Mutant Ninja Turtles and became the pilot of their Turtle Blimp.
• Alopex - a mutant Arctic fox who appeared in the IDW comic "Teenage Mutant Ninja Turtles Micro-Series" #1. She was created by Brian Lynch and designed by Kevin Eastman. She was an ordinary Arctic fox in Fairbanks, Alaska until she was experimented upon by humans and later rescued and trained by the Shredder. Initially an agent of the Foot Clan, she turned against them at the conclusion of the "City Fall" arc. When Old Hob offered Alopex membership into the Mighty Mutanimals, Alopex declined the offer.
• Armaggon - a mutant shark that is exclusive to the Teenage Mutant Ninja Turtles Adventures comics. Armaggon came from the future and teams up with Shredder and Verminator-X. He was first seen in the "Mighty Mutanimals" prelude to his first appearance where he fought Ray Fillet and Merdude where Armaggon claimed that he had fought Ray Fillet before in the future. He appeared in the SNES version of Teenage Mutant Ninja Turtles: Tournament Fighters. Armaggon made an appearance in the 2012 TV series, voiced by Ron Perlman in the fourth episode of season 4, "The Outlaw Armaggon."
• Bludgeon - a mutant hammerhead shark who appeared in the IDW comic "Teenage Mutant Ninja Turtles" issue 37. He was created by the Shredder and used alongside Koya as the contingency plan to attack Krang while in the Atlantic Ocean aboard Krang's ship in the event that a deal can't be made between Shredder and Krang.
• Bloodsucker - Exclusive to the Mirage Studio comics, Bloodsucker was a normal leech until Donatello, Leonardo and Michaelangelo decided to use it to get back at Raphael who had been disobeying Splinter and stalled their training. Raphael was afraid of leeches so the other Turtles decided to force Raphael to let the leech suck his blood. Bloodsucker sucked some of the mutagen out of Raphael and Raphael started to de-evolve back to a normal pet turtle. Bloodsucker started to evolve into a human-kind-of-thing. Bloodsucker later sucked out the rest of Raphael's mutagen. The other Turtles decided to capture Bloodsucker so they could get the mutagen back to Raphael. Finally, they found Bloodsucker and started a fight. During the battle Raphael (who looked like a normal pet turtle at this point) started biting Bloodsucker thus draining the stolen mutagen back. After a duel between them, Raphael had gained back all the mutagen from Bloodsucker and was back to his former self. Bloodsucker had also transformed back to a normal leech which Raphael freed back to the river it had come from.
• Dale McGillicutty - an intelligent human mutant who the Turtles encounter in issue 16 ("A Teenage Mutant Ninja Turtles Story") of the Mirage Comics.
• Groundchuck and Dirtbag - a mutant bull and mole and enemies of the Ninja Turtles.They appeared in the 1980s Teenage Mutant Ninja Turtles episode "Planet of the Turtleoids" Pt. 1, "Planet of the Turtleoids" Pt. 2 and "Escape from the Planet of the Turtleoids" voiced by Robert Ridgely and Pat Fraley. They were both Shredder's latest creations after they were accidentally created by Rocksteady and Bebop at the zoo.Groundchuck and Dirtbag were also bosses in Teenage Mutant Ninja Turtles III: The Manhattan Project. Dirtbag was a boss in Teenage Mutant Ninja Turtles III: Radical Rescue.
• Doctor El - a witch doctor that was turned into a mutant elephant by Shredder to serve him. Shredder didn't know that elephants are friendly creatures and Doctor El sided with the Ninja Turtles.
• Halfcourt a mutant giraffe with a basketball player motif and an ally of the Ninja Turtles.
• Ruff the Ref - a mutant flamingo with a referee motif who is Halfcourt's "Best Buddy." His action figure depicts him with a sling on his left leg.
• Herman - a mutant hermit crab who debuts in the IDW comic "Teenage Mutant Ninja Turtles" #38. He was Old Hob's attempt at making a mutant and appears as a member of the Mighty Mutanimals.
• Hot Spot - a mutant dalmatian with a firefighter motif and an ally of the Ninja Turtles.
• King Lionheartwas a Shakespearian actor who was turned into a mutant lion by Shredder to serve as his "King of the Mutants." This didn't go according to plan as King Lionheart sided with the Ninja Turtles.
• Koya - a mutant brown falcon. In the IDW comics, Koya was the pet brown falcon of the Shredder who was used for reconnaissance. Following the "City Fall" storyline in the IDW Comics, Koya later mutated into a humanoid form. She ambushes the Turtles and their friends at April's parents' farmhouse during the Northampton storyline. Koya is expressive and is excited and eager to hunt down her prey.
• Manmoth - a mutant mammoth who debuted in Teenage Mutant Ninja Turtles Meets Archie #1. In the "Origin of the Species" story, Manmoth was a caveman who was mutated into a mutant mammoth by Shredder in his plans to use him on the Ninja Turtles.
• Mona Lisa - a mutant lizard. She first appeared in the 1980s Teenage Mutant Ninja Turtles episode "Raphael Meets His Match" voiced by Pat Musick. Once a human trying to get a college degree in biology, Mona Lisa was kidnapped on a fishing trip and forced to work as an assistant to a pirate named Captain Filch when he attacked her boat. In trying to foil Filch's plans, she was turned into a mutant lizard with an encounter to radiation. After this, she vowed to stop Filch. She and Raphael met in the episode 'Raphael Meets His Match', when Filch was holding a yacht full of people hostage and teamed together to stop him. Afterward, she followed the Turtles back to New York but was never seen again. She will appear in the 2012 animated series, voiced by Zelda Williams.
• Monty Moose - is a baby moose that was mutated into a humanoid appearance after being separated from his herd and falling into Lake Ooze (a secret stash for Shredder's ooze). He has since taken a mounty motif and has sided with the Ninja Turtles.
• Bob the Beaver - a mutant beaver who is Monty Moose's "Best Buddy."
• Muckman - a garbage mutant who is an ally of the Teenage Mutant Ninja Turtles. In the 1980s' Teenage Mutant Ninja Turtles episode "Muckman Messes Up," Muckman (voiced by Townsend Coleman impersonating Jackie Gleason) started out as a garbageman named Garson Greer. He and his fellow garbageman Joe Junkee were exposed to mutagen when Rocksteady and Bebop accidentally poured mutagen on them where Muckman was transformed into a garbage mutant. Muckman and Joe Eyeball became allies with the Turtles when they realized that Rocksteady and Bebop were behind their mutation. Even though the Turtles planned to cure them, Muckman and Joe Eyeball declined stating that they have become comfortable with their mutant forms. In the 2012 Teenage Mutant Ninja Turtles series, Muckman (voiced by Grant Moninger) was introduced as Garson Grunge (originally voiced by Nolan North), a humble sewer worker who had encounters with mutants in the past, such as getting attacked by Leatherhead in "It Came from the Depths," a Squirrelanoids in "Invasion of the Squirrelanoids," Fungus Humongous' fear spores in "Fungus Humongous," and Pizza Face's minions in "Pizza Face". In "The Noxious Avenger," he was seen working as a garbageman when he heard a commotion involving the Turtles fighting Bebop and Rocksteady at an abandoned Kraang lab and got hit in the face with a canister of mutagen (which Bebop intentionally threw at Michelangelo) while investigating it. As the result of falling into the dumpster, Grunge mutated into a 6 ft. humanoid mutant made entirely out of garbage with a banana peel cap, an exposed and eroded skeleton, a toxic vomit, control over other garbage and dissolving abilities. Convinced by Joe Eyeball to be a hero when he found the Purple Dragons mugging a man, Muckman stopped them and beat them up. The man witnessed the action and talked about it on Joan Grody's show, becoming New York's new sensation. When the Turtles and April found Muckman and Joe Eyeball, Muckman blamed the Turtles for his mutation, yet both groups had to leave before Joan Grody could get a full glimpse of the Turtles. Upon seeing the news on Muckman, Bebop and Rocksteady planned to take advantage of this and looked for him. When they found him, he thought they were with the Turtles until they claimed that they weren't with them. They then convinced him to help them rob a Kraang lab again by claiming that it contains a cure, though Joe became suspicious of their motives. When the Turtles caught up to them, Muckman began to attack, but Bebop stopped him and told him to get the chemical while he and Rocksteady dealt with the Turtles. Muckman joined the fight and the Turtles were defeated, but they tried to reason with him and were all knocked out by Bebop's grenade. Rocksteady threw Muckman into the lab and is blasted with the Kraang's traps. Muckman found the chemical they were looking for but was blasted by another trap as Rocksteady took it from him. As a result, Muckman helped the Turtles by shooting slime at the chemical, destroying it while allowing Bebop and Rocksteady to retreat. After apologizing to the Turtles, he covered up their existence by telling Joan Grody that they were just people in costumes like the Pulverizer. He later subsequently befriended Mondo Gecko, and joined forces with him and was recruited as muscle of the Mighty Mutanimals as they help the Turtles fight the Triceratons, though sadly their efforts proved futile.
• Joe Eyeball - a small creature who is Muckman's sidekick. In the 1980s Teenage Mutant Ninja Turtles episode "Muckman Messes Up," Joe Eyeball (voiced by Rob Paulsen impersonating Art Carney) started out as a garbage man named Joe Junkee. He and his fellow garbageman Garson Greer were exposed to mutagen when Rocksteady and Bebop accidentally poured mutagen on them where Joe Eyeball was transformed into a small green mutant with eyestalks. Muckman and Joe Eyeball became allies with the Turtles when they realized that Rocksteady and Bebop were behind their mutation. Even though the Turtles planned to cure them, Muckman and Joe Eyeball declined stating that they have become comfortable with their mutant forms. Having developed feeling for Irma Langinstein, Joe Eyeball gave her a chunk of slime to remember him by.Joe Eyeball appear in the 2012 Teenage Mutant Ninja Turtles episode "The Noxious Avengers" voiced by Grant Moninger. This version is Muckman's left eye that was given life of its own and serves as Muckman's conscience, though he is capable of acting independently.
• Old Hob - a character that appeared in the IDW run of the "Teenage Mutant Ninja Turtles" comics. Old Hob was originally a stray cat who came across the Turtles and Splinter as they were getting mutated. Old Hob got exposed to it and tried to attack the pre-mutated Raphael only for Splinter to claw his right eye out. Old Hob became a mutant cat wearing an eyepatch and later teamed up with Baxter Stockman for revenge.
• Pete - a mutant pigeon who debuts in the IDW comic "Teenage Mutant Ninja Turtles" #35. He was Old Hob's first attempt at creating a mutant. Unfortunately, he lacked the expertise and the proper compounds to create intelligence and Pete came out less than smart. This leads him to kidnap Lindsey Baker, a former Stockgen scientist and try to convince her to make mutants for him. Pete appears as a member of Old Hob's Mighty Mutanimals. In the 2012 TV series, Pete (voiced by A.J. Buckley) was an ordinary common wood pigeon that was mutated by the Kraang into a humanoid form. During his captivity, he came in contact with April O'Neil's father Kirby and also a prisoner of the Kraang. Kirby O'Neil taught Pete how to speak and had him deliver a message to his daughter April O'Neil in which he wanted to warn her of impending danger. Under unexplained circumstances, Pete was either released by the Kraang after the experiment or escaped his captivity. Pete stalked April O' Neil for a few days and frightened her with his alleged attack before the turtles ambushed him and tackled him to the ground. After Pete had been captured, he was able to tell them his true intentions, he informs April and the Turtles that the Kraang intend to detonate a mutagen bomb into the city. He then revealed the location of the Kraang base in exchange for a loaf of sourdough bread. He then led the Turtles to the hideout of the Kraang where O'Neil was being held. He would later reappear as a member of the Mighty Mutanimals along with Slash, Leatherhead, and Dr. Rockwell, helping the Turtles defeat the Kraang and save New York.
• Perri Grey - an intern at Mergenterprise who debuted in "Teenage Mutant Ninja Turtles Adventures Special" #11. Her boss Dr. Koss was in league with an alien species named the Grem. When Perri and April O'Neil stumble onto this plot, both of them end up captured where April was mutated into a mutant turtle while Perri Grey was mutated into a mutant flying squirrel. After the Grem were defeated, April was restored by Perri who chose to remain in her mutant form where she would reverse-engineer a retro-mutagen batch if she needs to.
• Pizza Face - a pizza maker and an enemy of the Ninja Turtles. In the toyline, Pizzaface is Shredder's crazed culinary creator. Pizzaface had a plan to become the most powerful pizza chef ever. So he zapped himself in his Mutagen Oven hoping the energy would bake him with badness. But the hungry Ninja Turtles burst into the parlor and pulled Pizzaface out. Now this half-baked bozo wants to get even with the Turtles for foiling his formula. The effects of the Mutagen Oven had enabled Pizzaface to control anything pizza-related. Possessing the power of the pizza pie, Pizzaface is the ultimate Turtle nightmare: traveling from parlor to parlor, he terrorizes the Turtles, trying to turn them into tasty teen topping. Armed with flying pizzas and a Pizza Box Shield, this peg-legged pizza piper follows the Foot Clan, even though he's only got one good leg. And what's worse? He delivers. In the 2012 TV series, Pizza Face (voiced by John DiMaggio) was introduced as Antonio, an Italian pizza chef who ran Antonio's Pizza until he ingested mutagen thinking that it would be a good pizza topping, mutating himself into a huge mutant pepperoni and mushroom pizza with arms, a mouth, eyes made of pepperoni (resembling Pizza the Hut from the movie Spaceballs). He has control over pizzas around him. The pizzas have a mind of their own and desire to be consumed which will cause the person who ate them to fall into a zombie-like state "to serve their delicious master". He first appeared in the episode "Pizza Face," where Michelangelo went to Antonio's Pizza after his free Antonio's pizza attacked him when he refused to eat it. Mikey found Pizza Face's victims and was attacked by them in an alley by a pay phone that mentions Triceradons (which may be a spoiler for future episodes). Upon returning to the lair, he found his fellow Turtles and Splinter affected as he fought off Pizza Face's pizzas, interrogating one of them to find out who he works for. The pizza told Michelangelo about Pizza Face's origin and plans to feed off them. After putting the pizza into the freezer with Ice Cream Kitty, Michelangelo infiltrated Antonio's Pizza restaurant where Pizza Face was starting to make the humans into calzones for him to feed off of. Michelangelo confronted Pizza Face (who actually liked being called that) and fought the pizza-controlled Turtles until he was trapped in Pizza Face's cheese. Upon eating his way out of the cheese, he fought his way past Pizza Face's victims was swallowed up by Pizza Face only to eat his way out. Michelangelo threatened Pizza Face to free his victims or else. Pizza Face did what Michelangelo wanted as every one he brainwashed was freed. Even though it seemed like a nightmare to Michelangelo, it turned out that Pizza Face's slice had survived and was hiding in one of the pizza boxes.
• Sandstorm - is a mutant dromedary and an ally of the Ninja Turtles.
• Sally Pride - a mutant lioness who appears in the IDW comics. She alongside Ray are shown as mutant prisoners of the Null Group at the trainyard. Sally and Ray are later freed by Old Hob's Mighty Mutanimals and join up with them.
• Scrag - a member of Rocksteady and Bebop's gang in the 80's Teenage Mutant Ninja Turtles series. In his later appearances, he had the appearance of a mutant bat. Scrag's name came from a coloring book that featured the Teenage Mutant Ninja Turtles characters. Scrag also appeared in the Teenage Mutant Ninja Turtles comics that were published by Archie Comics.
• Scratch - a mutant cat with a prisoner motif and is one of Shredder's mutant allies. Scratch appeared as a boss in Teenage Mutant Ninja Turtles III: Radical Rescue.
• Jail Bird - a mutant bird who is Scratch's sidekick.
• Sergeant Bananas - a gorilla who mutated after Shredder had dumped Retromutagenic Ooze into his jungle gym and he walked through it. Sergeant Bananas became an ally of the Ninja Turtles.
• Larry the Lemur - is a mutant ring-tailed lemur who is Sergeant Bananas' "Best Buddy."
• Scumbug - a mutant cockroach. In the toyline, Scumbug's bio states that he was an exterminator that was hired by Shredder to deal with a bug infestation in the Technodrome. The exterminator got accidentally oozed and mutated into the mutant cockroach named Scumbug. Unable to face other customers, Scumbag saddled up with Shredder as his ace assassin in order to exterminate the Turtles. Scumbug first appeared in Teenage Mutant Ninja Turtles Adventures #10 in which he fought the Turtles in the sewers and was later confronted by Wyrm. As Scumbug and Wyrm fought knee-deep in sewer water, they accidentally got electrocuted by nearby power lines. However they would both return in a future issue, and were slated to return in the final story arc of the series, before its cancellation. Scumbug appeared in the Teenage Mutant Ninja Turtles episode "Night of the Rogues" voiced by Pat Fraley. He was among the enemies of the Turtles (alongside Rat King, Leatherhead, Slash, Tempestra, Chrome Dome, and Antrax) brought together by Shredder in hopes of defeating the turtles. Oddly enough while this was the first appearance of Scumbug and Antrax, April and the TMNT were familiar with the insectoid villains.
• The Uncanny Trio - is a group of mutant animals that first appear in "Teenage Mutant Ninja Turtles Adventures" #27.
• Hallocat - was originally the cat of a trucker until he fell into the mutagen.
• Nevermore the Scarecrow - was originally a crow until it got exposed to mutagen.
• Nocturno the Owl - was originally an owl until it got exposed to mutagen.
• Verminator-X - a mutant cyborg cat who is exclusive to the "Teenage Mutant Ninja Turtles Adventures" comics. In the future, Manx is the apprentice of Donatello. However, Manx begins augmenting his body with cybernetics, which causes him to grow insane. He then allies with the Shredder and Armaggon. Verminator-X made one last attempt to destroy the TMNT and allied himself with Craniac. He is only apparent in the future timelines, and eventually has a Catharsis in a controversial book in which Raphael is willing to kill him for the greater good, resulting in destroying the machine that had taken-over and poisoned Verminator's mind. At the end of this arc, ultimately Verminator survives and becomes the heroic Manx once again rejoining his friends.
• Walkabout - a mutant kangaroo from Australia that wears an eyepatch and specializes in crocodile hunting. His origin was not stated. All that we know is that he came to Manhattan where he met the Ninja Turtles and sided with them in their fight against the Foot Clan.
• Kid Kangie - an unidentified mutant who is Walkabout's "Best Buddy."
• Wyrm - a trashman who slipped and fell into Shredder's trash bin where he mutated into a mutant flatworm.

Other major characters

2012 series characters

Main article: List of Teenage Mutant Ninja Turtles (2012 TV series) characters

Crossover characters

Several characters from other comic book series have crossed-over into the TMNT universes. Notable appearances are listed below:

Cerebus the Aardvark

Main article: Cerebus the Aardvark

Flaming Carrot

Main article: Flaming Carrot Comics

Fugitoid

Professor Honeycutt also known as Dr. Honeycut is a semi-retired scientist from the planet D'Hoonib whose mind was transferred into his working robot as both were struck by lightning. As he refused to build a transmat device (a means of teleportation) for General Blanque of the Federation military in their war against the Triceraton Republic, he was categorized as a "Fugitoid" (short for "fugitive android"). The character was introduced in a series of strips in the Gobbledygook comics that was later finished in a one off self-titled comic book and then guest starred in the original TMNT issues 5 to 7, and later became a recurring character in the main TMNT comic. Kevin Eastman and Peter Laird had conceived the character years before the Turtles, and were even writing a Fugitoid comic they night they came with the TMNT concept. Eventually the character was introduced to the Turtles' universe with said issue becoming a lead-in to issue 5.

In the IDW comics, Professor Honeycutt was a Neutrino scientist who used to work for Krang. Honeycutt's wife Marra worried about the influence of evil that was oppressing the Neutrino people, including their family. She convinced him to have them join the Neutrino resistance. Three months later, Krang's armies had found where the resistance compound was and targeted it for attack. A fire broke out, and the living quarters were locked down due to safety protocols. Rather than let Marra, their son Ely, and the rest of the families burn to death, Honeycutt used SAL to breach the flames and override the safety protocols. By doing so, he sacrificed his own body where he became trapped within SAL in the process. Honeycutt saved the families, but his victory was short-lived. Sergeant Granitor ordered an attack on the fleeing families killing them all. Honeycutt could do nothing but watch them die on the security monitor. Not long after, Honeycutt had made it back to the lab, and Granitor and some Rock Soldiers found him. Honeycutt restrained himself from tearing apart the man who gave orders to kill his family and instead escaped through the portal he had been working on. Now in New York City on Earth, Honeycutt masqueraded as a blonde male to hide from the Rock Soldiers. Honeycutt took a job with Baxter Stockman at StockGen calling himself Chet Allen. Stockman worked with Krang, so Honeycutt was hidden within plain sight. Krang referred to the professor's new form as a "fugitive android." Rather than involve more innocents in the fight, Honeycutt allied himself with the Foot Clan. Although Honeycutt knew the Foot Clan were evil, they were enemies of Krang and his forces as well.

The Fugitoid appeared in the 2003 Teenage Mutant Ninja Turtles cartoon voiced by Oliver Wyman. Here his mind was transferred into the robotic body of his helper robot SAL after the pair were struck by lightning while Honeycutt was wearing a psychic amplifier device. Both the Triceratons and the Federation pursued him seeking to obtain his Teleportal device in order to gain the upper hand in their ongoing conflict, but Honeycutt found surprising allies in the Turtles. They wound up back on Earth courtesy of the Utroms' transmat, which later transported Honeycutt and the Utroms to their homeworld. However, upon learning that the Triceratons had pursued him to Earth, Honeycutt returned there after erasing the Teleportal blueprints from his mind. He was eventually captured by the Federation, but managed to infect their fleet with a computer virus that shut them down, with his body being fried in the process. Honeycutt's sacrifice touched both sides, and a peace soon resulted between the two. Fortunately, Honeycutt later returned, having uploaded a copy of his mind into Earth's satellite network prior to his demise. Leatherhead later built him a new body using Earth technology, and he would continue to provide aid to the Turtles, eventually officiating at April and Casey's wedding. He is also a playable character in the brawler game "Teenage Mutant Ninja Turtles: Smash Up" for the Wii.

The Fugitoid, AKA Professor Zayton Honeycutt, appears in the 2012 TV Series, voiced by David Tennant. He first appears at the conclusion of season 3 aboard his vessel, the Ulixes, just in time to save the Turtles, April O'Neil, and Casey Jones from a black hole created by the Triceratons. After they escape, he introduces himself and promises them that they are about to embark upon a great adventure. This version of the character bears a few similarities with the alien Time Lord, the Doctor, from the BBC Doctor Who (a character which David Tennant himself portrayed between 2006 and 2010).

Gizmo

Main article: Gizmo (Mirage Studios)

Horridus

Main article: Horridus (comics)

Knight Watchman

Main article: Knight Watchman

Rapture

Main article: Rapture (comics)

Savage Dragon

Main article: Savage Dragon

Miyamoto Usagi

Main article: Miyamoto Usagi

Miyamoto Usagi is a samurai rabbit and master swordsman from an alternative universe's 16th century Edo Period in Japan, where animals are the dominant species, not humans. He appeared in two episodes of the 1987 series. Usagi Yojimbo is a comic book series created by Stan Sakai starring the ronin hero rabbit, Miyamoto Usagi, which had several crossovers with the TMNT comics; apparently the TV show writers did not understand the distinction and misnamed the character after the comic book.

The character returned for the 2003 animated series with his actual name Miyamoto Usagi, and became a friend and close ally of the turtles, especially developing a strong friendship with Leonardo, since both are swordsmen. Leonardo also ended up in Usagi's dimension when Ultimate Draco scattered the five mutants to different parts of the multiverse.

Vanguard

Main article: Vanguard (Image Comics)

Wild West C.O.W.-Boys of Moo Mesa

Main article: Wild West C.O.W.-Boys of Moo Mesa

The Wild West C.O.W.-Boys of Moo Mesa are a trio of anthropomorphic cattle that work as cowboys that defend their home of Cowtown from various criminals. The group consists of Marshal Moo Montana, Dakota Dude, and Cowlorado Kid.

In issue #21 of Tales of the TMNT, the Teenage Mutant Ninja Turtles aided the C.O.W.-Boys into stopping the Masked Bull (the criminal alias of Sheriff Terrorbull) from stealing a magic crystal shard.