Haruhi is one of the most well known asexual character. She doesn't look interested by all the beautiful men in her club or the girls from Lobelia academy. Love isn't her thing. I can almost see romantics feelings flying above her head each time a character hit on her. I think that Haruhi is an Aromantic Asexual girl, but you can have your own interpretation.
Isn't there frenship awsome ? I see more than a friendship, like a queerplatonic relationship, with a lot of rivality, love and trust, but with no romance nor sexual attraction.
Maybe it's because it would be complicated for them to be in couple with someone else, but those two don't look interested in a romantic or sexual relationship.
***SPOILER***
They even use the rumors about they insestuous relationship as a way to be always together without thinking a seconde that it will be complicated for them to find someone special with this rumors.
I think that Sumikawa Kaichi is a biromantic demi-sexual. The way he dated a lot of girl, loved them, but didn't want to make love to them sound really asexual and since he always say that Miharu is the only one he sound more demi-sexual than gay. Well, that's an opinion form a biased person, but I think this couple would be even more awesome that way. O(≧▽≦)O
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Hmh.. Do you think that many (especially) yaoi mangas seem to that at least one of the charaters is usually demisexual? To me it feels that way - mangakas just don't seem to know about asexuality/demisexuality.