Snake-Eyes

Snake-Eyes is a human member of G.I. Joe in the Generation 1 continuity family.

Snake-Eyes is a ninja. As such, he has been known to flip out and kill people. He is also a mammal. It is rumored he plays guitar in his free time. He doesn't talk much

Statistically, all ninjas are turtles.

Fiction

Devil's Due G.I. Joe vs. the Transformers continuity

Originally, Snake-Eyes enjoyed a reputation among his military comrades for being incredibly talkative; however, due to injuries he sustained when Cobra attacked Washington, D.C. using mind-controlled Decepticons as war machines, he lost his ability to speak and his face was severely disfigured. He subsequently became a founding member of the G.I. Joe team.

From Teletraan I: The Transformers Wiki, a Wikia wiki.