I voted for both twins, and Tamaki.
For the twins, I can't decide still who I like better. Kaoru is sweet, calmer, and secretly also cunning, but watching Hikaru in his fumbling ways is also sweet and amusing in its own way. The twins take 1st place for me because there's something so captivating about the twin bond of friendship/brotherly(but NOT TWINCEST x-x
love.
And Tamaki...because he's so brightly optimistic, can still smile and be that goofy after how he grew up, and sees the best in people. And is a way refreshingly innocent, despite being such a lady charmer xD