(y/n) is a human that was chosen by Lucifer to be his, and all of the royal demon's, personal body guard. And then rises to be more.

Once a loyal Angel of Heaven. (Y/N) did everything he was ordered to do by Sera. (Y/N) believe in Heaven was absolute until it came into question when Adam asked him to join his Exterminator army. Let's say, that was the day (Y/N) defected from Heaven, and went into hiding in Hell. He made a name for himself throughout the years. Eventually being known as the leader of the Vees.