Well let's see she loves making others miserable, dealt Aang a death blow, not to mention could have killed Ty Lee just so she would join her which caused her "friend" to give up the life she loved. It also appeared in The Storm that when Zuko was about to get burned she moved in a way that seemed she was bracing for it all the time having an evil smile on her face. I also believe she would have killed Aang after she had pinned him to the wall in the fight in The Drill had Aang not woken up and repelled the attack. She also nearly killed Iroh, and has shown cruelty to animals(turtle ducks, and Appa). Yeah she's psycho and evil. Of course if she's not a psycho now she will be soon.
Edited on 05/21/2008 2:55pm