Birth year unknown. The fifth-generation head of the Fuma ninja clan, he led the rappa (ninja) force that served the Later Hojo clan for generations. Active during the time of Hojo Ujimasa and Ujinao, he specialized in guerrilla warfare and night raids. According to the 'Hojo Godaiki,' he was described as a monstrous giant standing over 7 shaku 2 sun (about 216 cm) tall, heavily muscled, with four fangs protruding from his mouth. He commanded 200 subordinates, achieving significant results in night-raid operations against Takeda Shingen's forces. When the Hojo fell in the Siege of Odawara (1590), the Fuma clan lost their masters and reportedly turned to banditry around Edo. He was eventually captured through the betrayal of a former Koshu ninja (a Takeda spy) and executed—most likely in 1603. Few historical documents conclusively prove his existence, but he remains an iconic figure symbolizing the Later Hojo's use of ninja warfare.

A mysterious ninja chief shrouded in legend. Despite his terrifying appearance, he possessed genius-level command of guerrilla tactics and the cunning to systematically deploy a 200-strong ninja force. A man of tenacity who fought to survive even after his lord's downfall.

As the figure symbolizing the Later Hojo's ninja operations, he is one of the most famous characters in Japanese ninja culture. He appears in countless manga, games, and novels, often portrayed as the 'strongest ninja.' Odawara, where the Fuma clan was based, promotes ninja culture to this day.