I'm going to point out that the art director for the newer God of War games has apparently been doing "realistic" Super Smash Bros. fan art, and his Sonic, which he put out before the trailer, actually ended up very close to the original movie design. (Though, it should be pointed out, leaning into the uncanny a bit is kind of the point of this sort of fan art.)
I don't think there's a lot you can do with Sonic, design-wise.
I'm going to point out that the art director for the newer God of War games has apparently been doing "realistic" Super Smash Bros. fan art, and his Sonic, which he put out before the trailer, actually ended up very close to the original movie design. (Though, it should be pointed out, leaning into the uncanny a bit is kind of the point of this sort of fan art.)
I don't think there's a lot you can do with Sonic, design-wise.