Senketsu is a battle uniform made out of life fabers and is one of the main heroes in the anime. He's created by Ryuuko's father and is worn by her. He needs to suck on his wearers blood so that he can be worn, this results into a lot of crucial moments. Senketsu has several forms each of which demand more blood. He can talk to Ryuuko and often advises her in fights. His charecter is very perverse. Made out of 100% life fibers. Thanks to that he dominates over the normal uniforms.