The images we see when Draxum is saying he is wanting to mutate every human on the surface we see a Rino, Warthog, Aligator, Shark, Giraffe, an anteater and a bull dressed in a matadors costume.
So that gives us Rocksteady, Bebop, Leatherhead, Armaggon, Halfcourt, and I guess Groundchuck. I'm not sure if Anteaters have ever been mutated in Tmnt so that could be a new character...unless that this series version of Dirtbag.
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