I have seen a few DCxMarvel dimension travel fics, and quite a few of them are of them are Peter Parker post-blip. Which gives me a crack fic idea: everyone who got snapped ended up in the DC universe. Yes, all of them.
The current world population is around eight billion, so half of that would be 4 billion... Yeah that would cause so so so many problems. But the DC universe is used to crazy shit.
Obviously there would be a sudden influx of "new" heroes and villains but with absolutely no context it is hard to figure out who is who.
Batman immediately trying to make contingency plans for all these new heroes and villains as well as figure out their civilian identities but this is very difficult because literally no records exist yet.
Magic users from both worlds team up, but I think they were still unable to fix it, the infinity stones were just too powerful. Also I think Dr. Strange and Constantine can't stand each other.
While I am at it, Wonder Woman and Loki would probably hate each other too. DC is more Greek but it has had their own version of Norse mythology, so maybe they are the same and have beef?
They would struggle to feed and house that many new people, but getting them jobs and integrating them into society would be hard too. And good luck proving anything anyone says. "You swear you have a law degree from Harvard? Okay I guess."
Do doubles exist? Yeah a lot of people probably don't have an alternate universe double, but it stands to reason some do. How do you deal with having a new kind-of twin? Or a dead friend or relative coming back, but different? Or even someone you never knew/doesn't exist in this world insisting they are family.
Some au double ideas I have seen people toss around are: Dick Grayson as Richard Parker, Kara Danvers as Carol Danvers, Steve Trevor as Steve Rogers, and Slade Wilson as/being somehow related to Wade Wilson, but I am sure there are other fun ideas out there too.
The snap didn't just affect humans/earth! So other planets are having the same problems.
Then randomly, five years later, just when people were getting used to the change, they all disappear again without warning. This causes as many problems as the original appearance did.
house md wildest show on earth. a main character outright assassinates a known dictator, a moment that would be the very beginning or the mid-series crisis in any other show - an act which creates a power vacuum in a foreign nation already filled with child soldiers and genocide, and it's literally only brought up again throughout the season because that guy's wife divorces him over it. and occasionally to explore his relationship with who he is as a person and a catholic after having deliberately taken a life for what he calculates as the greater good, but mostly it's about his divorce
Thinking about how as spiderbit got closer they went from speaking english to speaking their native languages and even sometimes each other’s. Thinking about how much q!pac has been speaking Portuguese around q!fit recently.
Thinking about how speaking your native language around someone even when you have another shared language you can speak is one of the greatest displays of love and trust on the qsmp.
Phil: Fantastic. Is there a waystone there? I didn't know there was a waystone at the-
Chayanne: [Throws Phil a photo]
Phil: Oh?
Phil: [Snorts] Chayanne, where did you get this? Is that where you came from?
Chayanne: [ I don't know I appeared there. ]
Phil: Alright, fair enough. Ok, let's get you guys into the- into the base. Let's go, come on. It's been a really long night. [Opening the trapdoor for Chayanne and Tallulah] I'll just keep spamming it, don't worry, just keep- just go whenever you can. Yep, perfect. Then- [he opens the next door for them] Go go go go. [Laughs] Nice. All right, good job, good job. Jesus Christ.
[Takes out the photo again and shakes his head, circling Vegetta's accentuated ass with his mouse cursor.]
Phil: ...God damn. God damn? [Reading the text] Casualonas? Las Casualonas? I mean, that's definitely Vegetta, right? 777. Uh, stay away from that place Chayanne, alright? You're not old enough.