Whedon writes strong characters because they are vulnerable. They worry and fall down and fail and get back up again. If they have any power at all, it is often a liability. They are not fearless, and that’s pretty much what makes them brave. They don’t saunter, and if they do, they stumble. They get nervous. They doubt themselves. Confidence aint no thing if there isn’t some fear as contrast. And total confidence? That’s both boring and silly. These boys and girls, men and women and demons, they often doubt their ability, their stamina, their strength. But they go through with it anyway. whatever it is.