Replying...
Intro. Hyakkimaru (百 鬼 丸), is the main character of anime Dororo, the boy is a Ronin looking for his body parts that were " for twelve demons, had this event due to a pact made by his father with other world beings. Then Hyakkimaru decides to leave on a journey accompanied by Dororo to kill 48 demons to get parts of his body back ... During his birth, his father made a pact with the demons and then Hyakkimaru was abandoned by his family, being dropped in a basket that wandered down the river. After a while, he was found by a man named Jukai, who created him and made prostheses for Hyakkimaru could get around, also taught the handling of swords and how to fight.

Hyakkimaru

@Mochinee-san