I think the characters with the backstories are usually more interesting, even if you end up having to use the same/similar colour palettes for plausibility :)
Least with your demon you can play around with the skin tones to make for a more visually interesting character :) Are those her favourite snacks floating around her? :D And is that cat getting squishied or is it a pillow? :O
I don't really have a favourite OC as such, there are a couplee that got drawn more often than the others mostly by virtue of being one of the first ones I developed XD
