Rou

is one of the humans fighting in the Holy War 3000 years ago.

Appearance
Rou looks identical to Ban, except with a neater haircut and a fringe that reaches his right eye. He wears a dark tank top and elbowguards with spotted, light colored pants and sandals. He wears the sheath of his sword on a belt that cuts diagonally across his waist.

3,000 years ago
King and Diane saw Rou when they are fighting against Calmadios. Rou is seen again talking to Meliodas and they become friends, even though Rou knows that Meliodas is a demon.

When the demon army approaches the Fairy King's Forest, he took the task to defend the forest while Meliodas, King/Gloxinia and Diane/Drole decide to go meeting the Ten Commandments and talk to them.