Zero

Zero is a minor antagonist in the Overlord anime (appearing in Season 2).

He is the leader of Six Arms, the combat/security branch of the criminal organization Eight Fingers in the Re-Estize Kingdom.

Zero is a powerful human monk (martial artist) nicknamed the "Battle Demon". He is a giant, bald, muscular man with extensive animal-themed tattoos covering half his body and face (such as a panther, falcon, rhino, buffalo, and lion). These tattoos allow him to channel shamanistic powers, temporarily granting him enhanced abilities inspired by the animals (boosting his strength, speed, toughness, etc., when fully activated).

He is arrogant, confident in his skills (claiming to be among the strongest in the Kingdom), and a strategic thinker. He specializes in unarmed combat and briefly clashes with characters like Brain Unglaus before ultimately being effortlessly killed in one hit by Sebas Tian after underestimating the vastly superior opponent.