Someone who doesn't have an inferiority complex, confident of her good points and doesn't need other to tell her her worth. Haughty and likes to brag but not to the point of being obnoxious.
Example:
Pellua Iyagi
Koi Dano Ai Dano
Don't Touch Me
Kare Kano

Any genre's fine, except harem. Thanks a lot!

DONDAKEE!!

GALS! - one of my personal favourites

Hyakujuu no Ou ni Tsugu!
Heroine Shikkaku (This one may be a little obnoxious, but to me, her confidence was funny/lovely most of the times.)
Girl Queen
Cynical Orange
Kimi Wa Pet
Ciel - The Last Autumn Story
Special A