Kaigaku is an Upper Moon six demon that used to be a demon slayer. Kaigaku uses a a modified version of a standard Nichirin Sword that is fused his flesh and blood. Kaigaku mastered five forms of thunder breathing but can’t grip on the first form. Kaigaku still uses all five forms of thunder breathing but Kaigaku’s blood demon art is called Electrokinesis, he is able to manipulate and unleash black lightning. He is brash and arrogant, and cowardly and selfish. Kaigaku is scared of Kokushibo.