Souko

Souko was the Assistant Chief of Data Management, General Affairs Division of the Palace of the Jade Emperor. From that day on, he became a member of First Regiment of the Western Army of Heaven. He is the main character of Tenjou no Ari. He didn't appeared in 3 first episodes of Saiyuki Gaiden but he was shown in Koubana no Shou.

(Source: Saiyuki Wiki)