Asmodeus

Backstory
Asmodeus is the Prince of Lust, otherwise the third of seven Princes of Hell.

In the infernal chaos of the Separ Dimension, Asmodeus was one of the seven souls that escaped from the dead husk of the Arca Mala. Prior to absorption, Asmodeus was one of the Martedian settlers. She killed an entire colony of humans that refused to join in on their plan, awakening Gaia's revenge.

When she settled in Hell, she, Leviathan and Belphegor allied together to lay siege on the plane. During the war, she betrayed the other two, and sided with Lucifer's legion. Due to this event, Leviathan still holds a grudge towards Asmodeus to this day.

Nowadays, Asmodeus is in a one-sided relationship with Lucifer, who doesn't show any affection towards her.