Lucifer (Midnightverse)

"Am I evil because you actually know me well enough to make that judgement or because dear old Dad said that once upon a time?"

- Lucifer

Lucifer, formerly known as Helel and now known as Satan, is the eldest of the Seven Archangels and the first Angel created by God. She is the mother and creator of the First Demon, Lilith, and the creator of both Demons and Devils. She was cast down from Heaven to Earth for tempting her siblings, Adam and Eve, to eat the fruit from the Divine Tree. She wandered the Earth watching over her brother and sister having grown very fond of them over time.

Lucifer met Issei when he was a child. She found him crying in the park after Irina left for Europe and his sister began bullying him. She became an older sister of sorts to Issei and she, in turn, became very overprotective of him.

Lucifer appeared after the release of Trihexa and deemed the entire world a failure and a mockery of her Father's vision. Lucifer summoned the Four Horsemen of the Apocalypse and began to wage war on the entirety of Creation. She was defeated by the combined efforts of Issei, Vali, Irina, and a repowered Michael.

Lucifer appeared again during the release and Second War against Tathamet.

Trivia

 * Lucifer's appearance is based off of La Folia Rihavein from Strike the Blood. Her child form is based off of Kanon Kanase from the same series and her vessel is based off of child Lucy from Elfen Lied.
 * Issei says that the only reason he wasn't a worse pervert was because of her.