If I were playing Power Enslaved, I'd cast my 'Demon' as a (currently) loyal servant. Think Paranoia-- 'Trust the Computer, the Computer is your friend, keep your laser handy.' And Immortality plays right into the "if you get killed, don't worry, you have clones" shtick.

Basically, just because the PCs are called "Demons" is no reason to buy into the whole "demons are evil and will seek to subvert your every order and tear your heart out at the first opportunity" shtick, a point she would make sure to point out. She's a tool of the Anointed, why are they distrusting an instrument of their divine's will?

Or maybe my PC would just be playing good until their suspicions are relaxed...