Zafar serves as chief trainer for enslaved fighters at the Valens Training School during Emperor Nero's reign. Once hailed as the undefeated "Wolf of Numidia," legendary as his era's strongest boxer, his career ended due to an injury sustained in his final match against Demitrius, the "Golden Lion of Attica." Severe damage to his left knee forced his retirement. Physically, he is an adult male with shoulder-length brown hair kept in a ponytail, gray eyes, and a beard. He typically uses a cane for mobility support due to this old injury and often wears sandals.

Post-retirement, Zafar transitioned to training enslaved youths for gladiatorial boxing in the Colosseum. His methodology emphasizes adapting boxing techniques to a fighter's physical traits, particularly developing speed-based strategies for smaller combatants. He trained Cestvs in a style focused on agility, rapid strikes, and evasion to counter larger opponents. Despite a stern demeanor, he shows genuine concern for his pupils' growth and well-being. His guidance extends beyond physical technique; he pushes trainees to overcome mental barriers, compelling Cestvs to fight seriously against his friend Rocco during a selection match, understanding their life-or-death stakes.

His past confrontation with Demitrius, Ruska's father, cost Demitrius his right eye, establishing their lasting rivalry and adding complexity to Zafar's role. His mentorship of Cestvs unfolds against this backdrop of entrenched rivalries and political intrigue within the Roman arena system. Zafar retains significant upper-body strength despite his injury, demonstrated by feats like crushing an apple bare-handed to illustrate focused power to students. His motivations appear rooted in preparing enslaved fighters not merely for survival, but to navigate the brutal path toward potential freedom through combat excellence.