Avenger-class Servant in Fate/Grand Order. Debuted in the GUDAGUDA Close Call 2021 event. Their real name is Mori Ranmaru, the younger brother of Mori Nagayoshi who served as Oda Nobunaga's retainer.
In Fate, their gender is listed as unknown, similar to characters like Enkidu and Chevalier d'Eon. However, unlike Enkidu and Chevalier d'Eon, who are truly gender-neutral within the game, Mysterious Ranmaru X is referred to as a female.
Character Design: Mika Pikazo
Voice Actress: Saitou Machiko (齊藤 真知子)