Hi it's me again, I have a few more questions in regard to fantasy!verse. 1) Due to Artiste!Mettaton being self aware in the loops like Stage, did he change up his strategies/actions towards Poppet!Frisk depending on their actions that loop? 2) When and how did the twins get separated from each other in the past? 3) How does Blackout determine when an AU should be destroyed and does he sometimes gets into arguments/fights with Fantasy over their fate?
1. Artiste doesnt get crystal clear memories from other loops, more of like... a cliffs notes of what happened (from his pov).
So regarding like, FIGHTs, he'd probably stay relatively similar since theres not that much time in a loop to rehaul his whole style. He might have a Special Attack, perhaps..?
But yes, he definitely also changes up his actions and I bet he does different broadcasts (canon Mettaton comes up with cooking, newscasting, theatre and just fight/dancing without much prep so I think artiste can work with the loop time) ... at the same time, he's also been in flowey's loops too so he probably feels a little bit stuck in a rut- but Poppet would be a new inspiration, in a way! (the feelings they inspire are. bad. initially)
2. The twins' backstory is a little wibbly wobbly but so far @candy-cryptid and I were thinking that they'd eventually stop in a Dancetale (2 dads acquired!), then accidentally portal to a Swapfell (2 more dads acquired!), and then from there Blackout would try to figure out how to portal and then get himself stuck in the Anti-Void.
His goop might start glitching a bit then (but it only really goes weird once he starts living in there full time), but he wouldn’t actually be stuck for long enough to become an Error or anything. However, he wouldn't be able to get out by himself- its his eventual realization of the resonation of his half-apple soul with his brother's that shows him the way out, like following a string of fate...
Fantasy + Blackout don't actually get separated from each other for long (except by choice once they're adults). That's one big difference between them and their canon counterparts- they run, but they do it together.
3. Destruction criteria... Well, just negativity isn't enough. There's obvious things like viruses/extreme corruption/hacking damage or worlds just totally falling apart, as well as worlds that never got finished (even if Fantasy tries, he can't be everywhere, and if the Creator leaves then he can't make them come back) and are slowly corroding.
He generally scans over worlds based on emotional tone but if anything catches his interest he'll observe the world for a while without interfering - he figured out how to set up viewing screens in the Anti Void.
He probably has a grudge against a lot of bitty aus because they're extremely dystopian under the surface, like snuff films.
Blackout's also not a fan of endless time loops with a lot of negativity- he'll generally try to remove the loop source first, but might just scoop the inhabitants out and dump them with Core Frisk somewhere and destroy the world instead.
He has a bit of a weak spot for someone pleading for anyone to help them when they know no help will ever come.
Negativity always exists, but a world that drives despair is disgusting to him.
When they were younger, Blackout and Fantasy used to argue a lot and SERIOUSLY about destroying AUs. But after one particularly terrible AU where Fantasy wouldn't back down, Blackout just left him there in disgust... Fantasy got very badly hurt before Blackout felt it. Blackout destroyed the world (there were probably a handful of monsters on Fantasy's side, but Blackout wouldn't have cared about that) and took Fantasy back to the Anti Void to heal. They've had a lot of conversations about why and what and how destruction can work and how Fantasy can't destroy himself trying to help when people don't want to be helped.
Now, they generally travel separately and they understand what each other are doing and trust they'll make good decisions. Blackout doesn't actually interfere/destroy worlds nearly as much as Fantasy does, and if he's ever uncertain he can always call for his brother and they can debate.
But if they both DO find the same AU and both STRONGLY feel they're right to try and save/destroy it, you know what might work? Let's fight for it. The extra time spent fighting might tip the world over one way or another/reveal more information that might change their minds. Also, since the twins are pretty equally matched, the winner is probably the one who is boosted by the AU in question- if it's more positive, Fantasy wins and has a better argument for his ability to fix things, and vice versa.
Even if one wins over the other, they'll still help their brother with things like destroying hackers/time travel misusers (Blackout) or deglitching/filling gaps/helping evacuate (Fantasy)