How to describe my brother as a little tiger?

My brother is like a cheetah. Just let him out of the door and he will run away without a trace.

He sometimes does his homework and draws quietly. Sometimes he jumps like a rabbit when he is happy, but he looks like an angry tiger when he is angry.

From the outside, I sometimes look like a dancing butterfly. When I love studying, I will fly freely. When I want to rest, I will stop in the flowers.