A Saber-class Servant who shows up in Lostbelt No.5, paired alongside Pollux. He's basically inseparable from his twin—the two come as a package deal in the story.
You'll see him mainly in Lostbelt No.5: Atlantis and Lostbelt No.5: Olympus, where he plays a significant role. He's also featured in the Fate/Grand Order CMs.
Beyond the main story, he appears in some side content: chapter 13 of Fate/Grand Order: From Lostbelt and chapter 72 of Type-Moon Gakuen: Chibichuki!, which is the chibi comedy spinoff.
Content compiled by AnimeList.moe from publicly available sources.
