A romance where the hero and heroine are the opposite of each other in some way, maybe in superficial appearance like in Hiyokoi or in personality like in Nodame Cantabile, but ultimately they are attracted to each other. They may not even be aware of the difference themselves or at least they may not care about it, it's more for the audience to enjoy.

Anther good example would be Siesta in which the main characters have very different personalities - the girl is dutiful, polite and deep thinking while the guy is hot headed and rebellious - but also seem like they're from different genres! The guy seems like a typical shounen hero and the girl like a shoujo heroine.

I'd prefer het couples and no hentai please. Shoujo, shounen, josei, seinen - it's all good

Personality:
Utopia (NEUK Dae Sam)
Tomodachi no Hanashi
Beauty Pop
The Friendly Winter

Superficial (and a bit personality...):
Horimiya

I'm not sure but maybe this will do...

You're so cool
Nobles' Love Company
AAA
Goong


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朝露の少女。

“The longer we live, the more weight we carry in our hearts.”

Thank you! Utopia in particular looks great. It's really good to find something thoughtful and unusual. I'd welcome any more (so greedy)

*Bump*

How about Can't See Can't Hear But Love.

Check out the "opposites attract" tag.

Yandere Kanojo

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Thanks very much for all the suggestions