Kotarou Fuuma

Kotarou Fuuma is a Assassin-class Servant summoned in Shimousa.

Identity

Kotarou Fuuma, the fifth to bear this title and served successor of Houjou Souun - Ujitsuna. Their original name derives from that of their village, which was Kazama, and they would normally earn provisions through hunting, lumberjacking and cultivating small fields. However, upon taking up a mission, they would call themselves "Fuuma" and have their dreadfulness become known across the land.
Fate/EXTRA Last Encore

Kotarou Fuuma is summoned by an unknown female Master during the Moon Holy Grail War. After arriving in the second floor, they both get killed during a fight with Dan Blackmore and Archer.
(Source: TYPE-MOON Wiki)