I hate fanfics.
I can respect that you use stereotypical and cliched characters and stereotypical and cliched worlds, but please, do not use characters and settings from another author.
It's not difficult, I could already do that with series, movies and animes, although if the author hasn't published for a long time, I would have to read his or her story again to catch up.
I don't think there is a problem, I'm sure I've already seen one here that has a theme of Nazi protagonists and another where the protagonist wants to spread Soviet Cominism in the other world.
I have read about this, this is a problem that exists even before wed novels, those who write lewd content have always been considered low status by writers of other genres, and they get upset when a lewd content writer is successful and popular
1. Ranma ½ - The first anime I saw, I loved it for its absurd comedy and its fanservice
2.Overlord - First isekai I saw, very fun, protagonist with questionable morality and good world based on D&D
3.JoJo's Bizarre Adventure - I love this saga because of how adsurd and epic its situations are...