Well, Kyouya is just like Takenaga Oda in The WallFlower or Perfect Girl Evolution
Though they differ a little in their personalities
because Oda changed at the end
Kiri from Beauty Pop is simular to Haruhi in personality like how they're so laid back, Ochiai from Beauty Pop is simular to Kyoya, and Momiji from Fruits Basket is simular to Hunny if you compare their cuteness.
I think that Wolfram from Kyou Kara Maoh looks like Tamaki, except his eyes are green, while Kyoya sort of reminds me of Satoshi from D.N.Angel. Oh, and Hani reminds me exactly of Momiji from Fruits Basket and a little bit of Maora from Shinshi Doumei Cross.