Ace is a demon who likes books. He is very quiet and keeps to himself a lot because he doesn't care to get to know anyone. He's been in the mansion the longest so he is very much acquainted with what the mansion has to offer. He is rather stuck up, grumpy, and cold with other members of the mansion. 

Ace has a medium pitched voice that is both cold and calculated. He doesn't mess around with people and will actively ignore anyone who he thinks isn't worth his time. He spends his days in the library reading romance novels. He's read almost every book in the library as a coping mechanism.