User blog comment:RunicVamp/Is Billie really Death???/@comment-29408332-20160813083633

I doubt that Billie is Death, the Grim Reaper, as that's quite impossible. As god said about the Archangels, it "requires primordial materials that we just don't have the time for" to even create an Archangel, so think about trying to recreate Death. Although, she could have just assumed the position of Leader of the Repaers, such as Crowley becoming King of Hell, but he's still a Crossroads Demon. You say she entered too easily: Repears are Angels, like Castiel, who is also able to pop into the bunker.

Stated once more: Crowley is the King of Hell, but he's never been referenced to as the Devil or Satan. Therefore, it would only make sense that if Billie was to rise to Leader of the Reapers, she wouldn't be acknowledged as Death, but a Superior Reaper.