Seigen Amawaka

天若 清弦

Seigen is an exorcist and the former holder of White Tiger, one of the Twelve Heavenly Commanders. He is also the master of Rokuro and Ryougo. [Spoiler] In the fight with Ijika Yuuto, Seigen loses his right arm, and quits being White Tiger Heavenly Commander. [/Spoiler] (Source: Sousei no Onmyouji Wikia)