Zed O'Brien is a major supporting character in the anime series Kekkai Sensen (also known as Blood Blockade Battlefront). He is a member of Libra, the secret society that protects Hellsalem’s Lot from supernatural threats. Zed is an aquatic humanoid from the fish-like race known as the Deep Ones. With a calm and stoic personality, Zed specializes in underwater combat and utilizes Blood Battle Techniques unique to his kind. His loyalty and strategic mind make him a valuable asset to the Libra team.