Raishin

Raishin (雷信, Raishin) is a Kamaitachi (Sickle-Weasel) and the eldest of three Kamaitachi siblings, his younger siblings being his brother, Juuro, and their younger sister, Kagari.

He and his siblings were driven from their old home when it was turned into a golf course and Juuro, originally a gentle demon became filled with hatred for humans and began wantonly killing any he found. When they heard that Ushio was in the area, Raishin and Kagari approached Ushio to ask for his help. During the battle Ushio after realizing where Juuro was coming from began to cry for the sufferings of yokai which moved Juuro, who along with Tora and the workers of a construction site managed to free Raishin and Kagari when they were pinned under a construction vehicle. Afterwards Ushio promised to find a place for the siblings to live, but Juuro, believing that such a place did not exist, attacked Ushio causing him to kill Juuro on reflex and he died, finally at peace. Afterwards Raishin and Kagari became staunch allies of Ushio and Tora, defending them against the wrathful demons of Tono.

Raishin and his sister Kagari detest other humans but they treat Ushio and Tora with great respect, calling them Ushio-dono and Tora-dono, and they do not blame Ushio for their brother's death.

Bakegyamon
Raishin, along with his younger sister Kagari are one of the few characters that makes another appearance in Mitsuhisa Tamura's second manga, Bakegyamon. Both of them mostly take on their human forms, and seemed to hold a grudge against Sanshiro but eventually warmed up to him, similar to their relationship with Ushio. However, their brother Juuro did not made an appearance.