Every once in a while, Blade would just perk his ears way up and look around with a sort of "What's that??" look on his face, but then shrug and go back to his usual stance. He'd also stretch and yawn sometimes.
With his sword equipped, he'd occasionally give it a couple of gentle swings in the air and point it forward with a dramatic pose.
He'd also have bonus animations when low on health. He'd normally stand low with his hand on his knee, panting. Wait long enough and he'll lose his balance.