Manga like the following (particularly the first two):

-Koi da no Ai da no
-Ore-sama Teacher
-Usotsuki Lily
-Gekkan Shoujo Nozaki-kun
-Skip Beat

Basically very funny, lighthearted manga with a very strong unique main character or premise. Doesn't have to be as plot heavy as Skip Beat, but not something as endlessly repetitive as The Wallflower or Special A. I also really liked the school politics in Koi da no Ai da no and Oresama Teacher, so something in that vein is welcome. Romance is not a must.

I'm pretty sure at least a few of these fit what you're looking for, check them out, they're some of my favourite manga. 😀
Horimiya
W Juliet
Faster than a Kiss
Takane to Hana
Beauty Pop
Wotaku ni Koi wa Muzukashii
Gokusen - technically this is classified as josei and has a rather atypical art style, but don't let that put you off, it's great

Drop by my fanfiction page! 😀 One Piece, Hetalia, Bleach, Harry Potter and more!
[url]http://www.fanfiction.net/~stelraetnae[/url]

I think you would like Gals!
Also Koukou Debut
Or Juuni Hizoku no Palette

I own all of these licensed and love them.

lovely complex
hot blooded girl

Both are very funny, hot blooded girl thou, if you can stand the drawing.
Lovely complex is definitely romance comedy with unique character 😀

ꉂꉂ(ᵔᗜᵔ*)笑

My recomendations: (in order or relevence to request)
Hirunaka no Ryuusei - fantastic main characters with dynamic relationship
Namaikizakari - sports club
Orange Marmalade - if you can forgive the vampire drama 🙂
last but not least Ame Nochi Hare - (just cus I love it)

Torikagosou no Kyou mo Nemutai Juunintachi maybe