Assassin-class Servant seen in Fate/Grand Order. The Old Man of the Mountain, and founder of the Hassan-i-Sabbah sect of assassins. His identity and existence are obscure even to his followers; the only proof he exists is when he executes a Hassan for straying from the intended path, along with any witnesses who see him.
Named First Hassan in the English version. Humorously, his voice actor is Nakata Jouji, who also voices Kotomine Kirei (and once had a Hassan as his Servant).
He is usually depicted as a strict moral guardian who adheres by his own code of honor, and often cannot tolerate seeing any woman wearing revealing clothes, though is generally very kind to those he deemed good or innocent, especially children.
