Hassan of the Serenity "Assassin, Miss Mary, Old Man of the Mountain"

About

Fate/Grand Order: Camelot
One of the order of Hassans. Like Hassan of the Cursed Arm, she is the guardian of one of the Mountain People's villages.

Fate/Prototype: Sougin no Fragments
On the first day of the First Holy Grail War, Assassin is summoned by her Master, Seiji Jinga, in an abandoned warehouse in the Tokyo Port area. Going up to Assassin, Seiji instantly gets captivated by her allure and despite Assassin being not very conscious, makes the mistake of kissing her.

(Source: Official site, TYPE-MOON Wiki)