I think the worst character right now is Nia from Gurren Lagann. Every thing about her form her character design to her personality, is just one big SUE shitfest!
First of all, she's completely ugly with her two toned sheep hair and retarded looking flower eyes.
Then there's her contrived intro into the story. Simon is at his worst ever because of Kamina's death and surprise! There's a cute blond loli princesses waiting for you in a box. Wow! what a 'convent' plot device. Oh and the twist is that the perfect sue princess immediately attaches herself to Simon and they fall madly in love with each other. Soooo original.
Now we get to the beast part which is her shit personality. I just love it how Nia never seems to do anything wrong and always accidentally does everything right. The beach episode was a perfect example of this. As in the wiki definition of Sue; "The author may seem to push how exceptional and wonderful the "Mary Sue" character is on his or her audience, sometimes leading the audience to dislike or even resent the character fairly quickly." I think this explains Nia to a tea.
I also love the fact that all the nisfag 4chan bitches seem to conveniently forget what a huge bitch she was in the first two episodes. Yoko and Simon are still feeling like shit because of Kamina's death, then Nia comes along and starts adding in her two scene about how "they shouldn't be putting all their attention on someone that isn't here anymore". Wow bitch! Way to rub salt in the wound.
I keep hearing Niafags bitch about how she was naive and didn't know any better. Wrong! She knows what death is and she knows what it's like to love and care about someone, there fore, she's not as "naive" as her stupid fans make her out to be. Also, even supposing she 'was' naive, then she shouldn't have shot her mouth off about something she has no fucking concept of. Either way you slice it she was a huge bitch, but everyone seems to just forget about that little part of the story.
To put it simply, she belongs in the same category of shitist leading female characters along with, Akane (Ranma 1/2), Naru (Love Hina), Mikuru (Haruhi), and Nagi (Kannagi)