>>715635018I think the way to go is making them, above all, selfish, fickle, and easily bored.
like greek gods
above all else they just want to follow their whims, and they have little to no capacity for empathy, especially with mortals.
they're not necessarily "evil," but many of them are perfectly alright with doing things which have evil ends.
one of them wants to reroute a river for no real reason? he'll go ahead and do it, never minding that it could ruin the lives of all the mortals who depend upon it.
one of them gets a liking for a certain mortal? sure, I'll use my powers to help you out, even if you want to become a warlord and engage in ceaseless slaughter.
but they, when a "favored person" suddenly starts getting cocky, that's when he's most likely to be abandoned.
of course, different ones have different priorities, and the powers of a "demon" CAN result in what we'd consider "good." one of them grows a fondness for a particular mortal who just wants to heal the sick and feed orphans? well, looks like that's a "good" "god"
you know?