Historically: The name Fuuma Kotarou was given to each leader of the Fuuma Clan/organization of ninjas which served the Later Houjou Clan, starting with its first leader. The clan started information-gathering and espionage activities in the time of Houjou Souun, the founder of the Later Houjou Clan. The clan name began as 風間, composed of the characters for "wind" and "space", but was changed to its present form, a homophone composed of the characters for "wind" and "evil/demonic/magical."

In its 100 years of service to the Houjou Clan, the most renowned Fuuma Kotarou was the fifth, who served Houjou Ujimasa and his son Houjou Ujinao (unknown - 1603). Stories say that he was 7'1". One of his most famous exploits was in 1580 and the Battle of Kise-gawa, during which he slipped into the enemy camp at night and caused mass chaos. Another famous ninja, Ninokuruwa Isuke, also belonged to the Fuuma Clan.

After the destruction of the Houjou Clan, Kotarou and the Fuuma Clan became thieves near Edo. Kotarou was captured and executed in 1603 from information given by Kousaka Jinai, another ninja-turned-thief who formerly served the Takeda Clan.

In Mirage of Blaze: Fuuma Kotarou leads the Fuuma ninjas in service to the Houjou Clan. He is described as a tall, slender man with broad shoulders and a muscular but supple body. He wears his hair long, tied in a long tail that reaches to his waist.