Sherlock!
Yuri P. Sucy Manbavaran, Repunzel, Thor. That was random but those characters have pretty hair and are my favourites.
Some yaoi I read had beautifully drawn long haired characters, sadly I don't remember any character, manga, mangaka name. You can try the tag long haired uke/seme.
Oh damn! I didn't realise you wrote manga and not yaoi.
Sorry, due to traveling I've been pretty much without internet for four days and, considering that I usually read 5+ hours of manga a day, I'm a tad more crazy than normal so I just have to ask - what fictional character has the best hair in your opinion?