Here is a figure that you can put together. It is made by Muzzle Vinyl in fall of 2020. In this case, the vinyl for the figure is somewhat soft. You have to put him together, but he is already fully painted when you get the 'kit'. After assembling, it says that you can still turn the head and move the arms, so it's not quite an 'action figure' but also not quite 'display figure'.
It is not that large at 16 centimeters high, however, it seems to be expensive at what is likely to be 66 dollars to buy it. But why is it so costly if it's not even assembled and it is also small and lacks articulation?

The likeness is pretty decent, it does look nicely like classic style Sonic. The paint is bright with very tidy edges and zero overspray. His expression is ok, set in the 'determined Sonic' look. It's a solid looking item, but a bit pricey.