I voted for Tamaki and Kyouya. If this poll weren't multiple choice, I would've only picked Tamaki--he's pretty far above everyone else for me. Kyouya's a little higher up than the other characters. I like them all, but I don't sparkle as much over them.
Tamaki...he's just so...him! He's just such a bizarre lead character and a complete idiot, yet he's also amazingly perceptive. His sensitive nature is more endearing than annoying to me. So easily manipulated, yet manipulative... Oh, and I guess I'm a sucker for his tears and naivety.
Kyouya? What's not to like about him? He's so evil.
Beware the Shadow King! And his reaction when Tamaki wakes him up? Priceless. (I can't wait to see how the anime deals with his story, which should be coming up soon. Then again, I've never seen the manga version of it either, so I can't judge... *rambles on and on*)