Kikuchiyo

A robot, once a man, who paid to have his body forged with a mechanized exoskeleton, much like the Nobuseri. He is often looked upon as a clown or a bother; he gets angry easily and often causes trouble. He carries the biggest of the swords, which also acts as a chainsaw when need be. At first rejected by the other six, Kambei accepts Kikuchiyo into the fold when the latter reveals his reasoning for helping the villagers - that he, too, came from a family of farmers. He is a largely sympathetic character, having literally given up his flesh to become a samurai and change his fate as a poor farmer.

He is well liked by the villagers, especially by little Komachi, who asks him to become her husband when she grows up, a request that he accepts in return for her keeping his (fake) family tree. (wikipedia) During the final battle with Ukyo, Kikuchiyo is severely damaged by Ukyo and gets ferried away from the battlefield by Rikichi, Kirara, and Komachi. But when Ukyo's fortress is set on a collision course with Kanna village, Kikuchiyo places himself between the two. Using all his strength, he single-handedly (literally) stops the enormous fortress from hitting Kanna.

But the strength he used to stop the fortress was so intense that he melted down to almost nothing, leaving only his feet where he had planted himself into the ground.