He's not a bunny...and he's not a robot...
He's a hybrid species between humanoid, kyroptera, and some sort of peacock (if you didn't notice the tail, it should be far more obvious now).
Eh, everybody else does. People who don't know his gender think he's female.
Heck, the fact that he is very feminine is not unintentional. It's part of a running joke, even.