Lapis

There's very little known about the origins of Abaddon. It is said that they are fallen angels created from some interaction between demons and angels, seeing as how they possess traits of both races. They are welcome among neither angels nor demons, so most choose to live in seclusion. So it is especially unusual that Lapis deliberately goes back and forth between worlds of angels and demons as a messenger despite these circumstances. However, that did not last long. She was banished from Heaven. With how smooth these procedures were, it looked like she wanted this to happen. Lapis, now exiled from Heaven, settled naturally into the Demon World. Her participation in the Ancient War brought about impressive achievements rivaling the Demon Kings themselves but at the same time, she also caused disasters that dealt great damage to demons, which resulted in most demons giving her the cold shoulder. Lapis stayed out of everyone's sight and played both the Moderates and the Hardliners to a balancing act to ease her boredom. Only Lapis knows which way the balance of power will swing.