The whole "I died and reincarnated but also brought along memories and perversions" trope. This works in Mushoku Tensei because it's integral to his growth as a character, it has a purpose and a reason in that "god" likes screwing with him and seeing what he does so letting him keep memories is natural.
Your brain and your consciousness are different. Your brain stores your consciousness, your brain stores your kinks, your brain stores your likes and dislikes and your personality. Your consciousness is simply your awareness of the world around you. Again, it works in something like Mushoku Tensei because we have an active force likely interfering and even if he isn't, it can be forgiven because it does play a part in the personal story and growth of the character. Other manga just use the "I was a japanese worker" because it's easier to set a backstory.
What makes it even worse is that this backstory makes no difference to the story or character. They never think "Oh gee I died suddenly, I hope mom is ok!" or anything like that, it's just "Oh snap I'm dead, time to make a harm!"
Like, they were a person BEFORE they died right? Even average people have friends and family, like come on man.
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Second most hated trope is Harems, for several reasons.
1. They're dumb.
Most people have enough of a hard time dealing with 1 lover, let alone several.
2. They're misused.
Historically, harems have never really been happy relationships for anyone other than the guy (AND THAT'S ONLY SOMETIMES!). They're typically full of backbiting, treachery, deception, jealousy, spite and outright hate. Real life harems are VICIOUS for a simple reason. The women want the guy, not each other. They want the man's heart so they'll do whatever it takes to get it and this would often lead to, in no uncertain terms, outright murder and assassination attempts. Harem women are absolutely RUTHLESS. Then imagine being the guy in that situation, where you have to make sure every woman you've slept with isn't trying to kill the other or manipulate you for favor. These were terrible situations all around.
Even if we ignored all of that, the guy usually ends up picking only like one or two women in the whole harem to be truly affectionate with anyway so it's not even like he benefits by having a large group of women around him, he's just horny and greedy.
These tropes ARE NOT for power fantasies, they're for political intrigue and drama because don't think that these women didn't have their own internal political groups against each other. Holy hell did they ever.
3. They're made of dumb tropes.
I think we all know by now, but the women in these harems are tropes and not characters. Like, to the Nth degree.
4. They're pointless.
We all know who the MC is gonna end up with, and it's gonna be the most milquetoast one of them because Japanese people have as much variation as a perfect circle.
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