Hi! Me again. ^__^
Doesn't have to be shoujo or straight romance, just has to have some. And one of the characters involved has to have strong stalker tendencies. You might think, eh, just open any old shoujo manga--but my next condition makes it difficult. The stalkerish character has to appear sweet, cute, kawaii. Not a domineering bad boy or smth like that, like it usually happens. Also, there must be a happy ending in that the stalkerish character's love is mutual.
Anime is just fine, too.

I know about Mirai Nikki, though she is a cute psycho, not just cute.

I think Molester Man kind of fits the description. I haven't read it though.

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It's not about which character I hate, it's about which character I not hate. ~Me

Are you looking for a yandere type of character?

Though she isn't 100% cute, Zenbu Shiritai fits pretty well.

Koharu no Hibi perfectly fits your description.

Oh, it gets a bit creepy at times, but don't let it turn you off.

Thanks! I'll be happy to have even more recs.

Yandere characters fit the description. Actually yes, I guess any such character in such a situation would have to be at least a little bit yandere.

Not sure if you're going to like it but Sukimasuki had a stalker x stalker couple (except the guy was barely a peeping tom, while the girl was on a whole different level).