It’s an AU based on a silly Tumblr roleplay blog I used to have a very long time ago. The gist of it is that it’s set in a universe where Sonic’s sole big adventure was Unleashed. His nightly transformations were never cured (though Dark Gaia did siphon most of the energy he built up), so he’s had to come to terms with it being permanent. It doesn’t mean all his other adventures aren’t supposed to play out, but they’re all basically out of order.
Sonic and co. have some slight personality changes. Sonic in particular is more naive and goofy, and a bit less cocky (jobbing as Super Sonic so hard the world splits and you’re permanently changed does a thing or two to your ego).
It’s meant to be mostly comedic, but if my skills allow it I’d like it to get emotional from time to time.