This is what I would include:
Leonardo
Donatello
Raphael
Michaelangelo
Splinter
Casey
April
Shredder
Karai
Tatsu
Baxter Stockman
Bebop
Rocksteady
Krang
Metalhead
Leatherhead
Mondo Gecko
Renet
Mitsu / Asuka
Chrome Dome
Fugitoid
Bishop
[DLC]
Slash
Hun
Venus
Tokka
Razhar
Usagi
General Winters
Shinigami
[TF DLC pack]
Wingnut
Armaggon
Man Ray
Hothead
Sisyfus
Triceraton
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