Red XIII is the name he received as a specimen designation while held captive and experimented upon by Professor Hojo and remains the name he is called by the party and in battle in Final Fantasy VII. Although he is 48 years old, he is developmentally equivalent to a 15- or 16-year-old human by his long-lived species' standards. He fights alongside Cloud Strife and his allies to fulfill his duty to the planet to defend it as a warrior.