I would have to say Kaoru because he knows of Tamaki's feelings. He also knows that Haruhi likes Tamaki and he respects that. He doesn't want to get involved anything that he knows he can get nothing out of. I think Kaoru is a very sweet guy and he knows what's right and wrong. Don't get me wrong, Hikaru fans! I love him to death too! He's a sweet guy, too!
