a demon could choose to do good or even repent and gain salvation.
Yes, yes, I think I understand why a fundie would be butthurt at the very concept that a demon could repent. Because if that is possible, it would mean that dickery is a CHOICE that anyone, no matter how vile, could work to improve from. So human fundies have no excuse anymore to be assholes to everyone else.
prominently in the works of Nail Gaiman
…His name is NEIL, not Nail, and he’s a FAR better writer than you could ever hope to be even if you sold your excuse of a soul to the devil.
but attained full cultural penetration through anime and manga.
…Yes, and? I happen to like the whole “ascended demon” or “succubus in love” tropes, even if they’re prevalent in manga. It shows that good CAN overcome evil. It shows that love IS stronger than lust.