|Name in Japanese||鉄斎|
|Voice Actor (Japanese)||Ryūzaburō Ōtomo|
|Voice Actor (English)||Beau Billingslea|
|Affiliation/s||Eight Devils of Kimon|
Tessai (鉄斎, Tessai) was one of the Eight Devils of Kimon. His ability was to turn his skin into stone, thus rendering normal forms of attack completely useless. When the Koga Ninja team attempt to enter Shimoda village both Tessai and Yurimaru are lying in wait.
After laying waste to the Koga Ninja, Tessai dismembers Hanza and drinks his blood while Kegero watches in horror. Tessai then captures Kegero when she tries to flee and takes her to an abandoned shack in Shimoda village where he intends to rape her. Jubei intervenes and the two escape after Yurimaru orders Tessai not to pursue them. Going against these orders, Tessai later confronts Jubei.
Only from being poisoned by Kagero earlier during his rape attempt was he weakened enough for Jubei's attack to harm him. He was then killed by his own blade when it returned to him. Jubei's attack severed his fingers, and so he was unable to stop his blade before it embedded itself into his head.