Kyo Sohma
From Animepedia
Kyo Sohma is possessed by the cat spirit. Although the cat is not part of the zodiac, it is included in the Chinese Folktale. He hates leeks, onions, miso (except in soup), and Yuki. But mostly Yuki (The rat).
His father hates him for "Killing" his mother. His mom actually commited suicide, because she hated Kyo.
Kyo is to be confined after he finishes Highschool.
Kyo wants to beat Yuki, because then he will become a member of the Chinese Zodiac (Or so Akito says). What most people don't know, even the Sohma's, is that another reason is because then Akito will stop calling him a monster.