Characters. Good, bad, but mostly ugly.

So, I have been working on this comic/ animation project lately and I have some pretty cool ideas on some of the other characters that will be in my story. I have been trying to create some Priests that would fit into my world. These characters are the ushers that set the story in motion. They are members of the Clergy. Also, they serve as a government agency that all smaller governments, ie; townships, municipalities, etc..., bow down to. The Clergy are the lawgivers, judge-jury-executioner, the overseers of civilization and science. They are the chairmen that govern the world.
These "beings" are said to have given technology and agricultural science to the early world in Mesopotamia, and gave knowledge of worship, and created the great temples of the world (the Great Pyramids, the Inca temples, etc...). After the seed of knowledge was planted in early civilization, the Clergy left the world to continue their work abroad. Some stayed in subterranean cities, but most of them went off world.
After the great Apocalypse that cleared the slate of civilization, the Clergy came back to put order back into chaos. For their own means? For their own survival? To what end? And why do they concern themselves with this planet, Earth? These creatures are not entirely human, but something else. Disguised. Modified. Corrupt? Tainted by their own vanity and pride? Perhaps. Their purpose is control. They are the gatekeepers. They have the knowledge and the intergalactic resources of the universe at their disposal. Does that mean they decide all fate? Not all, it seems.
Also, I have been working on some titles for the project. I have a good title, but I have to do some research to see if I can use it. Anyone have any good sci-fi names for the main character (the female badass)?