Quote from iriaa9
I think that Lovely Complex is somewhat similar to it...
I had the same thought. It's very similar in style/feel/structure, but different enough that it doesn't feel like a clone. Plus memorable characters who all have different looks, and Risa's pretty strong in her own way-one manga that doesn't seem like all the others.
If you just want strong heroines, Ouran or Perfect Girl Evolution may fit. Neither manga takes itself seriously, and both tend to lose track of their main plot/character development arcs, but they've got awesome herione's who don't particularly care for hero's, much less wait around to be saved. Ouran's got the better art and character development of the two, but PGE's got a stronger transformation arc if that's what you're looking for.
There's also trying other stuff by the same author. Her oneshots are pretty cute. (And if you're willing to give one shots a try, "The Kidnapping of Mina Jo's Boyfriend" may be your speed.)