My brain just decided to write about angels instead, so now I'm writing a book about how angels are actually scientifically advanced aliens that created humans and demons through experimentation, and Angels are really what humans call God...
Because atheist Angels are totally a thing.
I named the main character Niliel because each angel is really a "God" of something... Lucifer is really the God of Light, and Noctifer is the God of Darkness. And each angel's power is equal to their birth sign, which governs their power and special ability.
F is a baby angel, E is a child angel, D is a young adult angel, C is a common class angel, B is a battle ready angel, A is a great angel, S is a super class angel, SS is an unstoppable angel, X is Deity class angel, and Omega class is reserved for a true God.
Lucifer and Noctifer are both SS class angels. Only Riviel, Mastiel, and Tractium are confirmed X class Angels, and nobody actually knows who Mastiel, but they consider him what God would be but since nobody has ever seen him and he just exist inside the Angel registry, he's restricted in title to X class...
There are three factions for both Heaven and Hell. Guardian class Non-Humans protect the realms of Heaven and Hell, Earth class Angels protect Earth, and Nomad class Angels have free reign between all three worlds as diplomats. Lucifer was banished from Heaven after creating the Demons even though there were plenty of other angels that worked on the project, and there are angels that live in Hell, and Demons that live in Heaven, and there are only a few angels and demons actually banished from their home worlds. But Lucifer and Noctifer relay information about Heaven and Hell back to each other, and come to a conclusion that the Guardian class NH are about to go to war and potentially destroy Earth in the process because each side wants full control over the world.
*Breaths in heavily*... And that's where Niliel comes in.
Niliel (Not his/her birth name) is the only human to ever know the full story of the Angels and Demons, and after being confronted by Noctifer about having the most potential energy, Niliel agrees to become an Angel in order to protect Earth as Heaven's Last hope.
Thus the name of the titles I came up with "Heaven's Last Hope" or "Earth's Ambassador"
Listening to: Guilty All The Same - Linkin Park