I don't think a rabbit is too weak. They're bigger and stronger than gerbils, and as someone who used to have pet gerbils, I can tell you that gerbils have TEETH.

I go with the consensus that the Akimichi clan should be bears.

I like the idea of Tsunade as a cougar. I also have a voice in my head (a voice which I will smack momentarily) telling me she should be a cow. Udders, you know.