Marvel Cinematic Universe/Sonic the Hedgehog (2020)
An AU where the beginning of the events of the latter movie happens but instead of Green Hills, Montana, Sonic is currently living somewhere near New York which eventually gets him involved with The Avengers, Age of Ultron, Civil War, Infinity War, and Endgame.
The idea that S.H.I.E.D. and Nick Fury eventually discover him, the latter also attempting to recruit him into the Avengers Initiative.
Sonic I think would definitely feel a lot more at home in the MCU given there's superpowered beings just like him notably perhaps being pals with Hulk and Thor to eventually Rocket.
Dr. Robotik also rivaling Bruce Banner, Tony Stark, and Hank Pym in terms of intelligence, Robotik would probably have an ego that would have the three of them seeing him as the loon he is. Also Tails competing with those three, I could see Tony and Bruce Banner being jealous of him being so intelligent for his age.
Edit: Then again he could still live in Green Hills, Montana, don't think it'd change a thing as S.H.I.E.L.D. and Nick Fury would still look into him.