Lives in a hidden village with his friends. Lacks skills when it comes to swordsmanship, studying and horse riding but is quite strong in actual combat. Throwing specialized kunai as boomerangs is his only specialty. He is not interested in reviving his family's name and traditions.
Renya also has an artificial arm that he usually keeps hidden. He tried to enter into a contract with C.C in exchange for the power to save his friends that had been taken hostage but something went wrong. C.C. has described his situation as the first step towards a mysterious curse and claims that Renya's power is not Geass, blaming an unspecified third party instead.
After apparently killing off Isshin, the leader of the Japanese warriors who attacked his village, using the abilities of his strange arm, Renya went to save Carla and the rest of his friends.