Name: Assassin (formerly known as Hundred-Faced Hassan)
Age: unknown
Gender: Male
Race: Human...sort of
Personality: [url=http://typemoon.wikia.com/wiki/Assassin_(Fate/Zero)#Personality]
Appearance(s): [img=http://img3.wikia.nocookie.net/__cb20130620092318/typemoon/images/a/a1/ZeroAssassin.png]
Country of Origin: unknown
Powers/Abilities: 
[url=http://typemoon.wikia.com/wiki/Parameters_and_Skills#Presence_Concealment]Presence Concealment[/url]
[url=http://typemoon.wikia.com/wiki/Parameters_and_Skills#Expert_of_Many_Specializations]Expert of Many Specializations[/url]
[url=http://typemoon.wikia.com/wiki/Parameters_and_Skills#Librarian_of_Stored_Knowledge]Librarian of Stored Knowledge[/url]
[url=http://typemoon.wikia.com/wiki/Zabaniya#Delusional_Illusion]Zabaniya[/url]
Other: because Assassin can split himself into up to 80 different copies of himself, each with its own personality and appearance, there is no "real" assassin as some may think. In fact, they're all Assassin, just each one is a piece of him.