Thornpaw is not brave at all. In a fight her main strategy is to plead for her life, which has a 50% sucess rate. She hasn't died yet, but she has been hurt quite a lot. If she's comfortable she's generally happy and friendly, and she is actually mad protective of her clanmates. She'd much rather get hurt herself or lose a lot of her dignity than have them get hurt, and this also gets her in a few bad situations.