User blog comment:Wacky14/Oh great another mystery character./@comment-5269483-20120514175630

Possible Theory:

He is one of the Rune's,and he was once attacked by El Dorado.Therefore,he made himself a cyborg (Half human,half robot).He also made the "Time Bracelet" of Yuuichi,making him possible to help Tenma and Fey (His possible nephew/grandsom or something.He also knows more about Fey Rune's past,and maybe played sakka in his young days.

Ok the theory kinda sucks but its just a random guess~