More Twisted Lore, in this world Sonic never met Tails so he had to grow up on his own. Being bullied and hunted for being a monster Miles embraced that role and became a Monster.

Miles "Vile" Prower: An enigma who aligns himself with nobody but causes mayhem for everybody, rather than despair and hate themself they decided to embrace their role as the monster and revel in it. Vile is the boogeyman who ruins the plans of the Restoration and Robotnik just for fun. This Tails focuses less on mechanics and more on art and chemistry, his signature "Vile Mix" is a chemical he made allowing himself to light his own tails and the paint he makes on fire without harming himself.

Been a while I know.

Regarding AUs, the only one in the Twisted universe who knows of them is Miles, he was the first to create a stable Lense to view other universes and see what lives he could have had. He destroyed it out of fear, despite seeing the ideal life he realized that by gazing into the "what ifs" he would neglect his own life, and Vile is very selfish, he shattered his own creation and will fight Eggman and the Restoration if any side tries to replicate or discover his research.

been a while I know. Just adding some more lore. In this AU the chaos emeralds are called Chaos Diamonds and poses an Isohedral shape. The Phantom Emerald posseses the prime worlds gem shape. A fun lil change given how Diamonds can also come in a variety of colors. However these gems contain the fiery powers of chaos that can shape the land.

The ARK incident still happened however the prototype and final ultimate lifeform was swapped.

Bios is the perfected ultimate life form, essentially Swapping Shadow and the biolizards places, Bios is gruff and stern like shadow however they have become more appreciative of the natural beauty of the world making them a solid ally to Team Sonic.

Working on ideas for yet another Sonic AU, this time calling it "Sonic Twisted" the idea being a world similar to the mainline series just tweaked.

As an example, Twisted Sonic is much older and a lot less cocky, a bit gruffer similar to Shadow but still keeping that good natured heart, he's just perpetually tired and would rather get the job done and relax so less witty banter with his foes.