Occam's Razor. Not sure if that means anything but that's what's in my head.Urumi wasn't a very realistic character to begin with. She had a 200 IQ and could understand college level math at 5 years old plus the fact that she's psychologically disturbed. It wouldn't be that much of a stretch for her to have the ability to analyze people's behavior and manipulate it however she wants. When she's the most comfortable (like around Onizuka or her friends) she appears very laid back and enjoys going out to have fun just for the sake of it. Even all the elaborate pranks she makes seems to be only because she's bored which IMO sounds a lot like Ti-Se.