Xan Overman is not an individual character, but rather the name of a mecha from the anime series 'Overman King Gainer.' The Overmans are advanced bio-mechanical robots piloted by characters in the show. Xan is one of the unique Overman units, known for its distinctive abilities and powerful presence in battles. Its role in the series is significant, as it is piloted by important characters and often appears in key conflicts, showcasing the futuristic technology central to the story's world.