The tiger of Koutou. The chief of the Chousa region.
Descendent of the great strategist Sonbu, and a capable person himself too. Holds the legendary sword "Koteitou", a sword which is on par with the "Ryuuteiken". Sonken and the Chousa Four Riders also took part in the battle at the Korou fortress where he died while shielding his daughter from Ryofu's attack.
The 'Armor of Byako', the armor that was passed down by the founder Sonbu and also the armor which Sonken always have on is later passed on to his son Sonken.
In the Comic World version Gou appears to be already under orders of Sonken, his son. There he appears to entrust the Shin Koteitou to his son.
Weapon: Koteitou, Gaouken 01