"O Cards created by Clow
There one here who desires to become thy Mistress
A girl, chosen by Cerberus the Appointor, named Sakura
To test her worthiness as our Mistress
I, Yue the Judge, shall conduct
The Last Judgement"
Yue, Yue, Yue. He is the other Guardian of the Clow Book, and he is also made by Clow Reed, like Cerberus. His false form is Yukito. He said himself that he took that form to be close to and observe Sakura, the one chosen by Cerberus to be the new Cards Mistress.
He didn't approve at all of Sakura being the Card Mistress at first. Partly because he is VERY loyal to Clow, and he still has a strong attachment to him (not that Kero-chan doesn't, but, you know what I mean), and partly because she is a little 10 year-old girl. Cerberus commented that Yue always looks at the physical appearances, and not the inner strengths of an individual.
Yue was appointed by Clow to test the new master that Cerberus was to choose. He was to deliver "The Final Judgement". Sounds scary, ne? Well, be scared, be very scared, because you would NOT want to fight Yue. Yue is a strong one. He seems to have no mercy at all when he fought with Syaoran, and later with Sakura. But, Sakura used her wits and her sweet, caring personality, to win the match, and have Yue bow to her...But Sakura doesn't want that: she wants them to be friends.
Yue is not at all like Yukito. I mean, Yukito eats and eats as if he'll never be full, while Yue doesn't eat at all. But, hey, he's not even human, right? Also, Yukito always wears a smiling face. Yue wears one that says "get out of my way"....Okay, I take it back...in *some* ways, Yue is a bit like Yukito...Touya said so. It's hard to explain how exactly they're similar, but you'll have to watch episode 65 to know.
Yue is most usually the serious one who rarely talks, and his silver-violet eyes (W/N: *faint!*) showing no emotion. True, he IS a bit silent, but he also has a caring soul within him. A caring and knowledgable soul. He even helps Syaoran sort out his feelings one day (I'm not going to spoil any further about that), and he cleaned the kitchen when Kero made a mess!^_^ He is very loyal to Sakura and protects her with his life.
Notes about the name:
Yue means "moon" in Chinese. He is named so because his power is of the moon. Sakura calls him Yue-san. simple enough, ne?