Demons always got a bad press.
Azarial, is a demon, but not quite like you'd expect. She's rather nice to work for, provides room, board and a wage for her imp, Tonk, and is always ready to help friends.
So, why can't demons be just like people - well, maybe even nicer, considering?
That was why Cold Day in Hell was written - a little table-turning, and views from the 'other-side'.