assassin (learning with manga! fgo)
リヨ鯖 マンガで分かるアサシン ジョン・エドガー・フーヴァー
One of the original servants in Riyo's "Learn More with Manga! FGO". She first appeared in Danbooru post #2538704. Depicted wearing a babydoll.
True Name: John Edgar Hoover, the first director of the Federal Bureau of Investigation (FBI).
Assassin is implemented into Fate/Grand Order as one of Super Bunyan's Third Ascension partners alongside Rider. Assassin is voiced by Yonezawa Madoka.