"Because of his magic"? I never would have guessed that! Because he could do so many other things. (Although to be fair, a quick Knock now and then was handy for interruptions.)
I've just unlocked the monster guard thing (you've all finished this now, right? So I don't need to spoiler-tag things), and he's really powerful. Liking him. Although Robert, Rubella, and Finn all have their uses.
Tristis is rubbish. Cry, clown, cry. You deserve to.