male
El Hippo, the animal-born mutant Hippopotamus, is a common enemy in Teenage Mutant Ninja Turtles: Mutants Unleashed.
El Hippo (TMNT: Mutants Unleashed)
Hippopotamus
for Hippopotamus in Fictional animals by species
Suggested by matiasramonsanchez
Obviously, don't nominate any human characters. Hybrids like Cheetah or The Lizard are okay, as are shapeshifters with one set animal form (eg Professor McGonagall.)
