Mysterious Heroine X (Alter), Class Name Berserker, is a Berserker-class Servant summoned by Ritsuka Fujimaru in the Grand Orders of Fate/Grand Order. A very unusual intellectual Berserker. A diligent girl with an unassuming attitude. Her favorite food are sweets. A glutton character who requests high-class Japanese candies whenever she gets a chance, thus costing quite an amount of money. She spends her days off reading or listening to music, without taking a single step outside of her black, round table-type kotatsu. Fundamentally, a sloven person who tends to think of most things as bothersome. Yet, she strangely follows the orders and instructions from others with relative obedience, even while replying with sarcasm. She is quickly lured with sweet things. Her prided sword "Wicked Holy Sword, Necrocalibur" was bought from a shady mail order.