Eddie is a major recurring character in the Guilty Gear series, including Guilty Gear XX. He is the sentient shadow entity that inhabits the body of Zato-1 after Zato's death, effectively acting as a separate consciousness with its own will and motivations. Eddie is closely tied to Zato's story and serves as both a tragic and antagonistic presence. In gameplay and narrative, he is known for his eerie, shadow-based abilities and his role in the conflict surrounding Zato and Millia.