 If you liked
Vampire Knight
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 ...then you might like
Penguin☆Brothers
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The Main charachters are really similar, the way that Isshiki and Zero are both really emotionless, have a dark past and they secretly love the main girl character; Hina and Yuuki respectively and that the other main character ; Nishizaki and Kaname, also harbour feelings for Hina and Yuuki, although the don't show it as obviously. And, Koshiba is so like Ichijo. I also think the Black/White thing of Penguin brothers is like the Night/Day class of Vampire knight.