1. No. He can't fight, so think of him as like the Black Cat which follows players around in Fort Joy and hides when combat starts.

2. I don't know, but I think it's the latter, he's small, and you can talk to him.

3. Probably available at a price after the DE comes out, although everyone who owns the vanilla game on PC before the DE comes out gets Sir Lora for free (on PC).