|“||The cold and ruthless strategist who was feared by even my father...my teacher "Reiou".||”|
— Go Hou Mei, about Reiou
|Epithet||Seven Fire Dragons|
Despite being a male, Rei Ou had a petite build and a very feminine appearance. He had a clean shaven face with long hair, that was tied in a ponytail.
Rei Ou was said to have a cruel and merciless personality to the point that even Go Kei feared him.
At some point, Rei Ou along with Gai Mou sided with Earl Shi in his conflict against Tai Ro Ji, Ben Tou and Shou Sen, the other three Fire Dragons, with Tai Ro Ji being personally responsible for the death of Earl Shi's younger sister. This resulted in the deaths of the opposing Fire Dragons.
As a punishment, Rei Ou and the two other generals were incarcerated in an underground prison for 14 years.
Go Hou Mei called Rei Ou along with Gai Mou and Shi Haku to assist him in the war vs Qin. Rei Ou led his army against that of general Tou, believing that he would lead the main forces of Qin and also being intrigued by the opposing general's leading abilities.
After the fall of the Wei HQ in the hands of Kyou Kai, Rei Ou met with the fleeing Go Hou Mei and discussed the means to counterattack. At that point, Shin arrived at the scene in an attempt to take the head of the enemy commander in chief. Go Hou Mei tricked Shin into thinking that Rei Ou was, in fact, the Wei Commander in Chief and, as a result, the fire dragon met his end by Shin's glaive.
|Weakness: his students trap|
Rei Ou is an old-fashioned person. He doesn't think wars are about taking territory, but rather sees them as being about generals killing each other. After Wei's HQ has fallen he realized the weakness in enemy's plan and decided to consolidate all his forces to attack the exposed army of Tou and take his head, which would result in swaying the scales back to a Wei in a single strike. His plan, however, was stopped by Shin's surprise attack.