Nano

Human, demon, slave, switch, ex-kidnapper , and fire elemental, These- are just a few of the things Nano might be, depending on where she is, who she's with, and how she's feeling that day.

Some of the fiction that's inspired her:

"To Reign in Hell" by Stephen Brust

"Black Easter" and "The Day After Judgment" by James Blish.

The Culture Novels by Iain M Banks, in particular "Player of Games"

and, of course:Helsing