Object » Mutagen appears in 82 issues.
April O'Neil is a human female who, in most incarnations, was rescued by the Teenage Mutant Ninja Turtles after being attacked by thugs. After overcoming her initial fear of the Teenage Mutant Ninja Turtles, they have since formed a close friendship. In some incarnations, April is romantically linked with Casey Jones.
Always walking with Rocksteady following the orders of Shredder and Krang.
Donatello is the scientist and engineer of the turtles. Most known for his Bo Staff, purple bandanna, and the nickname "Donnie" or "Donny" as called by his brothers and friends. He is responsible for all the turtles vehicles of transportation.
Cyborg assassin.
Donatello from an alternate future, he has gained incredible wealth selling his inventions. He is depicted as a pure-hearted soul, being able to pass through the Netherworld unscathed. Don was also chosen by a group of alien scientists known as the Sons of Silence to share their wisdom to him.
Leonardo from a distant future who founded and runs a ninjutsu school where he is depicted teaching four of his most elite students; Bob, Miles, Carmen, and Nobuko. He also leads a police force called La Costa Nostra.
Michaelangelo of an alternate future and is portrayed as an artist who runs an orphanage.
Older and more hard-edged Raphael from an alternate future. He has traveled back in time to help TMNT several times. Future Raph wears an eye-patch as he lost an eye during a conflict with Shredder and Verminator X.
Master Splinter's former owner, master and father figure, who was killed by Oroku Saki. In some versions, Hamato Yoshi and Splinter are the same person.
Hun is a super enforcer that leads the Purple Dragon gang and works as a henchman to the Shredder. He has battled the four turtles on many occasions.
Jennika was a loyal member of the Foot Clan and Splinter's most recent protege. Jennika is now the first official female mutant ninja turtle in comic books.
Leatherhead is a mutated alligator that was found and raised by the Utroms. When humans attacked their base, the Utroms fled and Leatherhead was left behind. Leatherhead now works with the Turtles.
Leonardo is the calm, focused, and disciplined leader of his brothers, the Teenage Mutant Ninja Turtles. Nicknamed "Leo," he is usually seen with a blue mask and twin swords.
Cyborg assassin
A rat mutated by exposure to toxic ooze, Splinter raised the Teenage Mutant Ninja Turtles and trained them in the art of ninjutsu. He is also the mortal enemy of Shredder. He is a father figure to the turtles and is easily able to fight them all at once. He does not carry a signature weapon however he is well known to walk around with a wooden cane and also seems to be a incredible marksman with the bow and arrow. In some versions, Hamato Yoshi and Splinter are the same person.
Mikey is the comedian of the brothers, always making a joke. He is the fastest fighter of the group with his two nunchaku. Most known for his orange bandanna, the nickname "Mikey" as called by his brothers and friends, and the signature phrase of "cowabunga" which is used in a good amount of his incarnations. He is often considered the original Ninja Turtle because of the first concept art of a unnamed turtle that had nunchucks strapped to his arms.
Mona Lisa was a college student who was mutated into an anthropomorphic lizard. She is a friend and ally of the Teenage Mutant Ninja Turtles, including Jennika.
A heavy metal musician and skater who was exposed to mutagen fusing his DNA with that of his pet gecko. He is an ally of the Ninja Turtles and a member of Mutanimals
Old Hob is a mutant alley cat and enemy of Master Splinter. He leads a human street gang. Old Hob is also the founder and leader of the Mutanimals gang.
Mutant Wolf and henchman of Shredder.
Often misunderstood, or dismissed as the dark one, Raphael is known to go to the extremes with his anger. He has a hard time handling his temper, pressured from the unfair facts of life. Most known for his twin sai, red bandanna, and the nickname "Raph" from his brothers and friends.
Always walking with Bebop following the orders of Shredder and Krang.
Last of the Mutanimals, Slash was a psychotic alien turtle obsessed with palm trees who was initially an enemy of the Ninja Turtles. He later became the fifth member of the Teenage Mutant Ninja Turtles and was considered the strongest turtle.
The Rat King is a TMNT enemy with incredible strength.
Tokka is a mutant created when the Shredder had an alligator snapping turtle exposed to a substance called "ooze."
Venus is a Frankensteinish creation of Dr. Barlow. Originally she was a human who was mutated into a humanoid-frog.
Cyborg killer for hire, member of Megadeath, enemy of the TMNT and Mutanimals. He was beheaded by Slash
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