In Naruto, everyone's interest in someone seems unhealthy, though.Perhaps "just as weird" was a stronger word than I meant. The point wasn't really to say they were really the same, its mostly just to point out that Naruto's interest in Sakura is pretty fucking unhealthy. She mostly strings him along and has few redeeming qualities beyond her appearance.
The only sane one seems to be Shikamaru, whose revenge was justified and well carried out.
I can't think of one other [major] character that doesn't have at least one unhealthy relationship or feeling towards someone else.