User blog comment:Just a passing through Master/Demon Assassin/@comment-25848535-20190810154312/@comment-32751919-20190810162742

Well, his lore is mostly from history...and mix with what people see him and his appearance in the fiction. At least, his Mystic Eyes is what I make up, based on how the folklore describe him.

Hmm...actually, I was edit wrong I guess, I'm intend to make him a Arts based servant, actually. Sumanai...

Anyway, I would glad, if that can really help you.