Dororo

Dororo revolves around a rōnin named Hyakkimaru (百鬼丸) and young orphan thief named Dororo (どろろ) during the Sengoku period. The rōnin was born malformed, limbless and without facial features or internal organs. This was the result of his birth father daimyō Kagemitsu Daigō forging a pact with 48 sealed demons (12 in the anime) so that he might rule the land and increase its wealth and prosperity. In return, he promised the demons any that they want that belong to him. This enabled them to roam free and commit atrocities along the countryside.

After his mother Oku was forced to set him adrift on the river, lest he be killed by his father, the infant was subsequently found and raised by Jukai-sensei, a medicine man who used healing magic and alchemical methods to give the child prostheses crafted from the remains of children who had died in the war. The boy became nearly invincible against any mortal blow as a result of the prostheses and healing magic. Grafted into his left arm was a very special blade that a traveling storyteller presented to Jukai-sensei, believing it was fated to be within his possession ever since the boy had been discovered.