Okay... I feel the need to step in and say this. And I say it as someone who loves Nia to death and cries just THINKING about what happened to her.

SJust because she is a main character, does not mean she's not a sue. She has sue qualities. Especially when she first shows up. She gets better but she does have a lot of sue qualities.

Yes she helped Simon. Yes she is the only reason he was able to recover from losing Kamina. But don't be in such denial. =/