Assassin (アサシン, Asashin?), Silent Killer and Heroic Spirit of Assassinations, is one of the Four Cavalry Classes among the seven standard Servant classes summoned for the Holy Grail War. Servants of this Class are skilled at operating covertly, stealthy, and silently. Although most Assassins are famous for sneaky killings, Charles-Henri Sanson was a public executioner. This class is one of the weaker classes at fighting; as its members possess low attributes due to not having glorious legends as heroes, it instead specializes in killing Masters rather than Servants. It is an oddity compared to the more formal Knight classes who believe in fair duels and chivalry in combat; they will attack using the most unfair and favorable conditions, and with these conditions, it is possible for an Assassin to match and defeat other Servants. The Assassins' special class ability is ‘‘Presence Concealment”, which allows them to remain undetected when spying or preparing to ambush their targets.

Within the Fuyuki Holy Grail War system, it is said only the Hassan-i-Sabbah, summoned with the word "Assassin" as the catalyst, are applicable to be summoned due to them being the only true assassins to actually be recognized as Heroic Spirits. The Assassin in Fate/stay night, summoned by Caster, is an exception. He is an aberration in the system as another Servant summoned him. While he has Presence Concealment, it is his own ability rather than a Class Skill, and he appears listed as "Assassin?" in the Fate/complete material III Servant section. Heracles, even within the Fuyuki system, has qualifications for all classes besides Caster, so it is unknown how he would fit into the role of Assassin. The rule originally remained in the Great Holy Grail War system, but Masters eventually managed to bypass it after the abilities of all nineteen Hassans became known. The Moon Cell Holy Grail War of Fate/Extra does not mention any such rule ever having been in place.

Known AssassinsEdit

Servants marked with are also able to be summoned by the Protagonist in the Grand Orders.

True Name War Master
Hassan-i-SabbahFirst Holy Grail WarUnknown
Hassan-i-SabbahSecond Holy Grail WarUnknown
Hassan-i-Sabbah (Midget)Third Holy Grail WarUnnamed Puppet-user
Hassan of the Hundred FacesFourth Holy Grail WarKirei Kotomine
Sasaki KojirouFifth Holy Grail WarCaster
Hassan of the Cursed Arm*Fifth Holy Grail War - Heaven's FeelZouken Matou
Li ShuwenMoon Cell Holy Grail WarJulius B. Harwey
Jack the RipperGreat Holy Grail WarSagara Hyouma
Reika Rikudou
SemiramisGreat Holy Grail WarShirou Kotomine
SthenoGrand OrderProtagonist
Jing KeGrand OrderProtagonist
Charles-Henri SansonGrand OrderProtagonist
Phantom of the OperaGrand OrderProtagonist
Mata HariGrand OrderProtagonist
CarmillaGrand OrderProtagonist
Dr. JekyllGrand OrderProtagonist
Mysterious Heroine XGrand OrderProtagonist
Shiki RyougiGrand OrderProtagonist
EMIYAGrand OrderProtagonist
Shuten-doujiGrand OrderProtagonist
Fuma KotaroGrand OrderProtagonist
CleopatraGrand OrderProtagonist
King HassanGrand OrderProtagonist
Yan QingGrand OrderProtagonist
Wu ZetianGrand OrderProtagonist
Mochizuki ChiyomeGrand OrderProtagonist
Kato DanzoGrand OrderProtagonist
OsakabehimeGrand OrderProtagonist
UnknownGrand OrderNone
Hassan of Intoxicated SmokeGrand OrderNone
Hassan of SerenityFirst Holy Grail War (Prototype)Seiji Jinga
Manaka Sajyou
UnknownSecond Holy Grail War (Prototype)Unknown
No Name AssassinFalse Holy Grail WarJester Karture
Hassan-i-SabbahFalse Holy Grail WarFaldeus
Hassan-i-SabbahFifth Ainsworth Holy Grail WarShinji Matou
Hassan of the Hundred FacesFifth Ainsworth Holy Grail WarIllyasviel von Einzbern
Hassan of SerenityFifth Ainsworth Holy Grail WarMiyu Edelfelt
UnknownUnknown Ainsworth Holy Grail WarJulian Ainsworth
Okada IzoStrange Tales of the Imperial Holy GrailMajor Reiter
UnknownNone (Learn More with Manga! FGO)Olgamally Animusphere
Tokugawa IeyasuKoha-AceUnknown
Takuboku Ishikawa (Kaede Makidera)Fate/Grand Order x Himuro's WorldRitsuka Fujimaru

Nonstandard AssassinsEdit

Servants possessing the Class of Assassin for special reasons unrelated to a proper summoning.

True Name War Master
Arjuna (Fake)Grand OrderJoan of Arc (Alter)
Nitocris (Swimsuit)Grand OrderProtagonist
Scáthach (Swimsuit)Grand OrderProtagonist

Other qualifying heroesEdit

True Name Current Class Notes
Calamity JaneArcher
EMIYAArcherFate/Ace Royal only
Hassan of the Quaking PipeN/A
Hassan of Shadow-PeelingN/A
Lü BuBerserker
MedeaCasterFate/Ace Royal only
Okita SoujiSaber