Yamazaki is one of supporting characters of Cardcaptor Sakura.
He is voiced by Issei Miyazaki also voiced Subaru Sumeragi in the Japanese Version, Phillip Pacaud in Cardcaptors, Joshua Seth also voices Tai Kamiya, Hige in second film and Alejandro Saab in Clear Card Arc in the English Version.
Yamazaki almost always has his eyes closed, though he did open them once, and they were dark blue or purple.
He loves to blabber, tell lies (which many people believe, stupidly), and make fun of people. He likes to be a smart ass (and he knows it). Yamazaki blabbers quite a bit about where something would come from, like flying penguins, or sleeping (eh?).
Yamazaki and Chiharu Mihara are a couple, and care a lot for each other... though Yamazaki loves to tease Chiharu. From what I have heard, Yamazaki is always willing to win something for Chiharu, and give it to her as a present.
Overall, Yamazaki really seems to be quite funny (to a certain degree), and later on, he can get annoying.
Cardcaptor Sakura: Clear Card Arc