What type of demon is Yomi?

Just asking, just in case anybody had any ideas of their own they would like to share, या knows of any exclusive information not दिया in the ऐनीमे या manga.

It’s for a प्रशंसक fiction I'm लेखन and he's a character, and since I like to be thorough with my characters this information would help me out a lot. I am currently unfamiliar with any fandom concerning him, if there is any, so I guess I'm asking about that as well. I guess the real सवाल here is, what type of demon would आप like Yomi to be, या can accept him as in a प्रशंसक fiction?

(*Note, there will be romance, I think, but not with Yoko XD)