Mutants

A Mutant is any being who has been exposed to Mutagen and undergone some form of transformitive mutation.

Definition
The idea of a mutant is a common trope in comic books and science fiction. The new phenotypes that appear in fictional mutations generally go far beyond what is typically seen in biological mutants, and often result in the mutated life form exhibiting superhuman abilities or qualities.

Within the realm of TMNT, the term "mutant" is almost exclusively used to describe any being who has been affected by mutagen, rather than any naturally occurring mutations. Mutagen can mutate a being in numerous ways, ranging from animals taking on human traits (such as The Turtles and Splinter) to humans taking on animal traits (such as Bebop and Rocksteady), to either taking on the traits of other objects (such as Muckman) or simply growing in size and strength (such as the Super Shredder). The 1987 TV series stated that whatever was being mutated would take on the traits of the last living thing it touched. This is not stated in any other series, and would seem contradictory in many cases.

Mirage

 * Donatello
 * Leatherhead
 * Leonardo
 * Michelangelo
 * Raphael
 * Shredder Elite
 * Splinter

Movies

 * Donatello
 * Leonardo
 * Michelangelo
 * Rahzar
 * Raphael
 * Splinter
 * Super Shredder
 * Tokka

1987 series

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Hamato Yoshi/Splinter
 * Bebop
 * Rocksteady
 * Mondo Gecko
 * Muckman
 * Joe Eyeball
 * Mutagen Man
 * Napoleon Bonafrog
 * Genghis Frog
 * Rasputin the Mad Frog
 * Attila the Frog
 * Scumbug
 * Baxter Stockman
 * The Two-Headed Bull from Mutagen Monster
 * Slash
 * Groundchuck
 * Dirtbag
 * Leatherhead
 * Tokka
 * Rahzar
 * A. J. Howard
 * Titanus
 * H.A.V.O.C.
 * Raptor
 * Overdrive
 * Highbeam
 * Amok
 * Magma
 * Seizure
 * Rudolph Cobrato
 * Tattoo
 * Scrag
 * Carter
 * Synapse
 * Grillox
 * Gargon

Archie

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Hamato Yoshi/Splinter
 * Bebop
 * Rocksteady
 * Scrag
 * Man Ray
 * Leatherhead
 * Chameleon
 * Scumbug
 * Wyrm
 * Mondo Gecko
 * The Uncanny Trio
 * Hallocat
 * Nevermore the Scare-Crow
 * Nocturno the Owl
 * Verminator-X
 * Armaggon
 * Merdude

2003 series

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Splinter
 * Leatherhead
 * Dark Leo
 * Dark Don
 * Dark Raph
 * Dark Mike
 * Underground Monsters
 * Quarry
 * Razorfist
 * Stonebiter
 * King Nail
 * Underground Cyclops Monster
 * Underground Insectoid Monster
 * Underground Spider Monster
 * Shredder Elite
 * Hun (Turtles Forever)
 * Tokka (Turtles Forever)
 * Rahzar (Turtles Forever)
 * Purple Dragon (Turtles Forever)
 * Foot Ninja (Turtles Forever)

IDW Series

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Splinter
 * Leatherhead
 * Old Hob
 * Alopex

2012 series

 * Leonardo
 * Donatello
 * Raphael
 * Michelangelo
 * Hamato Yoshi/Splinter
 * Leatherhead
 * Dogpound
 * Fishface
 * Snakeweed
 * Spider Bytez
 * Dr. Tyler Rockwell
 * Buttercup

Others

 * Doctor El
 * Halfcourt
 * Hot Spot
 * King Lionheart
 * Monty Moose
 * Sandstrom
 * Sergeant Bananas