I had this really weird game idea
Where the main character’s family(except the main character duh) is killed by some random guy

And when the main character finds the culprit some years later they find that the murderer is actually him a whole lot years older

The murderer explains that they are trapped in a time loop, and for some reason they’re dragged into the past at a specific age, and they have to kill their family in the past to uphold the time loop or else the entire universe collapses from the time paradox(it’s not specified but I’d say the time loops have been there for a while)
So the main character has to find a way to unloop the time loop without collapsing the universe, while looking for their past selves’ journals where they keep what they know(they’d be scattered around the world)
There are a couple of stuff I need to smooth out but it feels kinda fun to play if it was a game lmao

So there are two OPM fics in mind currently:
-The first one considers that Genos self-destructed himself to deal with that veiny anomaly in the final battle, and after a year of waiting for his trial, is sent back into the mortal world to ‘finish his unused years, for god damn’s sake’. He technically possesses a dead kid and goes to find Saitama. Shenanigans follow, and eventually Genos loses his self as he merges with his identity of a kid.
-the second one is more or less a OPMxUndertale crossover with the duo falling in while investigating an energy spike. Saitama’s out for the action for most of the fic, and Genos attempts to forge a way to the barrier while having to convince that his name doesn’t mean he’s in for genocide. At the end Saitama just punches the barrier and Flowey rages a lot.
Just kind of inbox me which one you want me to do for Christmas break, and I’ll start working on it.