It is a known Fact that Geno becomes Error in the fandom, not that anyone actually knows that in the Undertale multiverse. Otherwise Reaper and aftertale Sans would freak out a bit <3
There are three timelines Geno can have I like the most, if its forced God Error is up to you:
Geno saved by Reaper.. marriage and kids. May still lead to Error
Geno never saved and becomes Error
Then the final one, Geno meets Error.. Fatal is born...
Which can have interesting thoughts on how this happens
Ink gets a great idea, Error can't destroy if he never becomes the destroyer.
So he steals some toys from TK Sans and makes a new paint, and hits Error with it.
It causes a slight paradox in the timeline, Error still exists but Geno still exists also instead of erasing the Error timeline.
Instead Error is later drawn to Geno, as only one of them should exist and thus Fatal is born.
Now only Fatal exists, this unstable overpowered character that no one can defeat and because they were born from a paradoxal timeline time and the multiverse is unraveling. The only way to save it, Save Geno and somehow fix it so the original Error timeline returns.
Problem is, Fatal is the only being that could get them to the timeline they need to fix it.
Good luck with that.
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Idea Factory
FanfictionUndertale ideas, some crossovers. may write them, but also up for adoption. please message me if you want to adopt one as I'd like to read it myself <3