Disclaimer: Ouran doesn't belong to me...yet...
Mori
Mori, contrary to popular opinion, was not anti-social. True, he rarely spoke, but that did not mean he disliked speaking. Rather, it was just that he liked watching more than talking. He liked to watch Huni devour a cake, savoring every bite. He liked to watch the twins, to find the differences that he knew were there, but couldn't see just yet. He liked to watch Tamaki, sulking, or otherwise, to figure how well appearances can fool others. He liked to watch Kyouya, and always hopes to catch a glimpse of his elusive smile. He liked to watch Haruhi, who was the catalyst of change for them all. It's just that, sometimes, he's so busy watching, he forgets to talk.