it is this
at the beginning of the game , you will have a battle with the skull face ,
According to “Snow”， it backed , but i cannot find it everywhere
AAAAH! It's my hot dearest! I called him demon hottie or just Skull Demon cause it's what he's originally called-
And yeah maybe it's a soon to be sprite or it could be connected to the main story or just a side quest. But it's not yet an implimentation is what it looks like so it's pretty much useless trying to find him.