Even though my take on the entirety of FNaS ends at 3, this here is the idea of a bad future, which the events of FNaS4---and next, Rockclones----comes.

This BAD FUTURE is where this variation of Toymare won after the events of FNaS3 and went into hiding. Golden Sonic who's still alive surprisingly, but is slowly dying, tried to recreate his friends in order to destroy "the Scrapnik", but he accidentally created what he calls them "Ghoulbornes" because it sounds cool and all.

These Ghoulbornes are malice, yes, and are bloodthirsty, but they only kill things that gets in their way to find the Scrapnik.

All I have for this take on FNaS4 is that someone goes in what remains of Sonic's Heroes Pizza Palace just to look for some valuable things present, but their path had crossed with these Ghoulborne clones.

As for this guy in the bottom right... he's sort of is this version of Nightmaric, but he definitely has nothing to do with this take nonetheless.