Naoki Sera is a fictional character from Crows X Worst, part of the delinquent manga universe centered on Suzuran High School and its rival gangs. He is known as a tough, street-smart fighter with a calm but intimidating presence. As a member of the series’ rough schoolyard conflict world, he helps define the atmosphere of loyalty, violence, and hierarchy among delinquents. His role supports the broader themes of friendship, rivalry, and earning respect through strength.