Fergus mac Róich

Fergus mac Róich, also known as フェルグス・マック・ロイ, is a Saber-class Servant in Fate/Grand Order (FGO). He is a legendary warrior from the Celtic Ulster Cycle, renowned for his immense strength, voracious appetite, and generous nature. Fergus is a member of the Knights of the Red Branch and the foster father and close friend of the hero Cú Chulainn. His Noble Phantasm is the "Spiral Rainbow Sword" Caladbolg, capable of destroying terrain, and it is said that its sword light once cleaved three hills. Despite his power, he is bound by a geis with Cú Chulainn that limits his full potential. Fergus has a magnanimous personality and is generous to those he trusts, but he never forgives betrayal. He is also known for his powerful sexual appetite, with legends stating that it required seven women to satisfy him. Fergus is a popular character in FGO due to his unique personality and powerful abilities. He appears in multiple story arcs within the game. In addition, a child version of him also appears in the game.