Character profile
Hassan-i-Sabbah
ハサン・サッバーハAssassin / アサシン / Hassan of the Hundred Faces / Old man of the Mountain
Biography
Hassan-i-Sabbah is the nineteenth leader to take that name and the mantle of Old Man of the Mountain within the Hashshashin. His many distinct personalities compartmentalize different abilities, and his Noble Phantasm can manifest those personalities as separate autonomous entities. Like the other Hassans, he can only be summoned as an Assassin.
Story spoilers
During the Fourth Holy Grail War, Assassin serves Kirei Kotomine and is used mainly for reconnaissance. The personality that most often interacts with Kirei is a young woman named Asako.
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