[Kenai]

Yes he has a personality and free will of his own. But since he is the binded summmon he is required to obey his master. Fortunately for him though his summoning was completely accidental so there are circumstances were he can bend that rule. It it also unfortunate because of the chaotic nature of their unknown "contract" there's a few other quirks that'll jump out as well. I'll leave it to you to decide what they are most of the time.

Other than than your demon can be whatever you desire.