Embodiment of Heat
The idea that heat is the core of all life. Like when sleeping, humans sleep easier warm than cold, and are more alert in cold/darkness. The belief behind this that life is naturally geared towards light and the mere fact of existing rather than the cold and the icy feeling of death that comes with it. Stars are the most basic form of this, both hot and provides life to their surrounding solar systems and/or contributes to a massive galaxy, while black holes swallow up this warmth/life/light.
How will this benefit the plot?: A certain event regarding Faote will occur, causing a lot of characters to be traded in for the Embodiment of heat. Needless to say, shit will hit the fan when the embodiment actually comes about. Also, the reason for the Embodiment of Heat's existence also serves some backstory as well, as minuscule of an effect as it may be.
<SPOILER>
Faote, Katherine, Prophet, Shu, and Eve all outright die for this embodiment to come about. False Heaven is destroyed, and the most furthest advances in Alchemy led by Faote are forever lost as a price as well.
</SPOILER>
Yes, this is an official request.
Why didn't I post it as a new character? Because I'm not ready to show exactly what the crap is going to happen.