Zato One is a recurring character in the Guilty Gear series, including Guilty Gear XX. He is the former leader of the Assassin’s Guild and a powerful, dark-themed fighter who uses shadow-based abilities in battle. Known for his dramatic presence and tragic backstory, Zato plays a major role in the series’ lore as a fallen assassin whose body is linked with the entity Eddie. In Guilty Gear XX, he serves as a notable antagonist and one of the game’s distinctive, technical combat characters.