Character » April O'Neil appears in 591 issues.
Dr. Abigail Finn is an expert biologist and technologist and monster hunter.
Alberto is a rogue animatronic from the Rise of the Teenage Mutant Ninja Turtles series.
A mutant arctic fox iconic to the Teenage Mutant Ninja Turtle comics, formerly an agent of the Foot Clan.
The spunky red-head who is the Turtles' main ally and friend on the surface world.
The spunky red-head who is the Turtles' main ally and friend on the surface world. In certain incarnations, April was an assistant working for Baxter when she discovered his criminal activities.
Always working with Rocksteady, and following the orders of Shredder and Krang.
Bludgeon is a mutated hammerhead shark created by the Shredder.
Chi You is a Chinese god of war.
Harleen Quinzel was a psychiatric resident at Arkham Asylum, where she met the incarcerated Joker. Falling in love with her patient, she conspired to break him out of prison and eventually became his lover and loyal sidekick, Harley Quinn. She eventually left him to be her own woman, and has been enemy and ally of Batman, and various other heroes.
A mystically powered mob boss from the TMNT universe. He is an enemy of April O'Neil, and criminal rival to Chien Khan. He is the leader of the Golden Triangle Gang.
An enemy/ally of the Teenage Mutant Ninja Turtles.
Kid Terra was a one time henchman of Mr. Null and an enemy turned friend of the Teenage Mutant Ninja Turtles and Mutanimals
A shape shifting witch born in feudal Japan who has helped the Shredder through the ages.
The Shredder's pet falcon that he used for reconnaissance, but has recently been mutated.
Kraang Subprime is a an evil Utrom, chief spy, and subprime leader of the Kraang Hive Mind, who disguises himself as a schoolgirl named Irma to spy on April O'Neil.
A warlord banished from Dimension X, now an adversary of the Teenage Mutant Ninja Turtles as their other main villain.
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.
A character from TMNT.
The spunky red-head who is the Turtles' main ally and friend on the surface world. Mousers were sent after April after she found out about Stockman's opprobrious activities.
Nevermore the Scarecerow is an Mutant Crow, enemy of the TMNT.
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