I haven't read JJK but I think
JJBA:can suck depending on where you live, but most of the world isn't affected. Except for the end of p6, I guess
HXH: most of the crazy shit is in the dark continent and except for the rare situation where something gets out. Nen users are far and few between, but obviously dealing with the troupe would suck
Naruto: You could have terrible world wars and monsters, but there's at least some level of statesmanship keeping the conflicts to a minimum usually. Naruto himself grows up in something like global stability, and most of the Naruto world actually lives in the five countries, and not in the ninja villages. I don't know how bad the alien stuff gets in Boruto though. Could be bumped up
AOT: pretty fucked up, but depends on when and where you're at.
OPM: pretty horrible monsters, and you can't rely on someone saving you most of the time, but at least there's some hope
OP: The world has ended twice essentially, ancient weapons exist, giants terrorizing countries, obviously celestial dragon tyranny, pirates fucking over countries, Rocks burning down towns, Countries being enslaved like Wano,horrible monsters and sea creatures that could easily destroy your town, horrible weather and conditions, implication of some pretty bad diseases and brutal wars between countries, as well as human trafficking/racism. Though it depends on when/where you're born, but the implication seems to be that the world might have been *worse* before the government existed, which is pretty horrifying.
Dragon Ball: You could have your entire planet wiped out by some weird alien shit, or like, Beerus.
