Replica is a highly intelligent and resourceful autonomous Trion Soldier from the anime and manga series World Trigger. Acting as a mentor and support system to Yūma Kuga, Replica provides tactical analysis, guidance, and vital information about the Neighbor world. Despite lacking a human body, Replica displays a caring and protective personality toward Yūma, often advising him during battles. Replica plays a crucial role in the early arcs, helping Yūma and his friends navigate the complexities of Border and the threats from other worlds.