I like the romantic subplots in Homestuck, mainly because they're just a natural extension of character interaction as opposed to lovey-dovey fantasy stuff.
Of course, it goes without saying that they attracted entirely the wrong sort of people.
Personal rankings:
Karkat > Vriska > John > Dave > Aradia > Jade > Kanaya > Rose > Terezi > Nepeta > Eridan > Equius > Tavros > Feferi > Gamzee
--
~<_<