At Toy Fair of 2018, Diamond Select Toys revealed their display figures for Sonic & Tails!
These larger 3D figures combine clear & solid color plastic for a feeling of action for each character.
Sonic is shown holding a purple chaos emerald while grabbing a ring & leaping off the edge of a GHZ type path. The 'dust' from his jump is done in clear yellowish plastic for a speed effect.

At the right is an exciting preview-look at the Sonic figure. Figures were released as Gamestop-exclusive in 2018 and later released in SegaShop (2019 for US and 2020 for EU). 

This Sonic is a PVC, so not too costly or fragile, which is great for collecting. 

The Sonic is different from it's initial prototype one, as they have switched his emerald color to green (it was the same as the Tails one) which does look better if you were to display them side by side. The 'splash' effect around his toe adds action and looks great in the transparent plastic. He's quite on model, the paint looks good...and it shows nice action with the pose.

Prototype photo discovered by Taaron