PrinceOfNilfheim

Yes, we don't know when exactly, but it was sometime between hanabi's birth and Hinata's kidnapping attempt

"I like chicken, I just don't eat the neck, back, breasts, wings, drumsticks, and thighs." -ahh sentence

It implied that Nezy was an experiment, it is possible that the only reason he has a quirk is due to an artificial process.

The guy that controls people with his voice didn't pass, he was accepted into the General Course and later managed to transfer to the Hero course

No, Spider-Man lived a shitty life because he had a bad case of impostor syndrome, every time something bad happens, he thinks that he NEEDS to interfere, because ignoring it is as bad as causing it in his mind. His first MCU quote explains this very well. "Every time something bad happens, it happens because of me."

Sukuna was better at Reverse Cursed Technique(I think) since he could also heal other people, you might get RCT from Sukuna before getting infinity from Gojo

Casual watchers still cosplay, in fact, I think they do so more often than others because it is more likely that they have the disposable income to do so.

There's a luffy gamer self insert in QQ that uses both a sword and a gun

Depends, knight/noble warriors were skilled in many different weapons equally, and would use any of them depending on the situation. Unless they have a specialty(as in you're disproportionally more skilled/in favour of one particular weapon) or you own a Valyrian Steel weapon, people tended to switch weapons very often, either they get rusted, you find a better one, or it just suits their needs.

As the parent instead of the son*