Oberon is a major character in Fate/Grand Order, introduced as a mysterious fairy king-like figure associated with the Lostbelt Britain storyline. He appears charming, playful, and enigmatic, but his true nature is far more complex and deceptive. In the narrative, he serves as both an ally and a hidden manipulator, deeply tied to the events of Avalon le Fae. His role is central to the story’s themes of illusion, betrayal, and the conflict between fairies and humanity.