Gah, I'd not choose with the eagle, for example, a flock of eagles picking on someone who is on a warrior cat rp? Not the best choice... and what Kovu said about wings. (I get everyones moods down xD) Though it would be good to have as a random object flying around in the sky that you could ride.
Bunnies: Bunnies would be awesome, better than having weird looking feline bunnies. however, the size is kinda impossible to adjust. Like a giant bunny walking around would be quite unrealistic. and the emotes wont really fit it. The same with the running, the mods would have to break their backs making new animations.
Dragons: Idk.
Though a lemur would be awshum. wit der huge jumps and little paws. daaww