Longshadow is a fictional character from the Marvel Comics universe, primarily associated with the X-Men series. He is known for his ability to manipulate shadows and darkness, which allows him to create illusions and conceal himself from enemies. Longshadow often serves as an antagonist, using his powers to challenge the heroes. In addition to his shadow manipulation, Longshadow has a complex backstory that ties him to various characters within the X-Men lore. His abilities make him a formidable opponent, and he often engages in battles with well-known mutants like Wolverine and Cyclops.