Gamma is a fanfiction series that reimagines the Harry Potter world with a darker, more mature tone, focusing on Harry Potter being raised by Severus Snape after the death of his parents. The story explores themes of trauma, redemption, and complex family dynamics as Snape struggles with his past loyalties and his growing bond with Harry, who becomes a powerful and morally grey wizard. Readers enjoy it for its deep character development, the intense emotional conflicts between Harry and Snape, and the fresh, gritty take on the wizarding world that challenges traditional good-versus-evil narratives.