BlackJack O-Hare first appeared in Incredible Hulk #271.
Yes. I know. He's a bunny. In fact he's the leader of the notorious Black Bunny Brigade.
O'Hare has many of the same attributes of
an average rabbit except for his intellect which
enables him to speak, among other things such
as use advanced weaponry and carry out complex
tasks with extreme precision.
He, unlike other rabbits, can walk upright.
Don't believe me? lookee here: [link]