I can understand your way of thinking, but I would think that if you were seemingly perfect than you would come out as an incompetent nitwit who was happy about everything. I would see that as being more reasonable if she was the kind of person to get good grades, and is as you describe a girl next door kind of character (cute, kind, unassuming, and honest). Even if the protagonist saw her as evil, should would still have a basic understanding of who she actually was, and would see here as the classic i'm too popular for you kind of girl, rather than an evil pessimistic prankster. Of course it is your character, and I'm not a GM, I was just expressing thought on ways you could improve. So don't take offense to what I say!