Hyou

Hyou is the Second Rashou. He is a descendant of the main Hokuto bloodline and Kenshirou's true older brother. After being separated from Ken as a child, his memories were sealed away by Juukei, the scar on his forehead being the result of this. Hyou was favored by Juukei over Kaiou due to his bloodline, but plays a subordinate role to Kaiou in the present.

(Source: Wikipedia)