On top of my head?
Leonardo
Raphael
Michaelangelo
Donatello
Splinter
Casey Jones
Slash
Shredder
Bebop
Rocksteady
Karai
Krang
Bishop
Rat King
Alopex
Zog
Traag/Rock Soldier
Baxter
Mondo Gecko
Hun
Savanti Romero
Renet
Leatherhead
April?
DLC
Usagi Yojimbo
Fugitoid
Neutrinos
Different skins
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