Black

Age: Unknown
Species: Demon
Birthday: September 6th
Height: 172 cm

Black is a demonic content creator interested in Youtube videos and the hidden sides of people's hearts. Black loves collaborating with humans and will write long contracts full of fine print in order to trick them into going along with his nefarious schemes.

In chapter 21-22, it's revealed
that Black has not always been a demon, having originally been the seraphim for the heavens thousands of years ago. Black became a fallen angel after being exiled by God, whose traitorous ways he was seeking to expose, before Black eventually chose to reincarnate as a demon and stay in the Underworld after defeating him.