Yuki Sohma

From Animepedia

Yuki, the "Prince of Kaiwaia High" (or Kaibara High as it's called in the manga) is attractive and popular. So popular, in fact, that he has his own fan club run by girls of the high school. But he does not let any girl get close to him, and for good reason. Clever and quick witted, Yuki's natural charm and sharp, witty demeanor make him an appealing friend. Ever curious, Yuki welcomes a challenge. Born on the year in the rat (which he turns into when hugged by a girl or when he becomes weak), Yuki's biggest rival is Kyo (the cat).