To go with Classic Mighty (above), here's Jakks Pacific's classic Sonic action figure with his red spring accessory. He has the same 11 points of articulation as the rest of these do (no elbows) as is the usual. The red spring looks just like it does in the games, and is sized appropriately as well, so it is a nice thing to have to continue setting up your scene.

Sonic himself looks good, the circle body is normal/shape, and the head taken from the CG from the games is of course, spot on. The paint looks good, without overspray. He's big enough to capture all the detail of textures and paint. It's quite a decent figure & certainly one to get for Classic style Sonic fans.
The thing that's slightly odd is that they seem to be giving him expressions that Classic Sonic never really had / they seem to be trying a little to make him more like ModernSonic....but it doesn't quite work. This has the mouth somewhat open, and there's white there for his teeth but instead, it looks a little like he has odd white lips instead. Classic Sonic was generally so simply done he wasn't designed to have teeth/inner mouth details & etc.

What doesn't make sense here?
The waves of figures. As you can see, the figure has a picture of who else is supposed to be on this release/wave along with it. But everyone else is modern! It should have had classic Mighty & Sonic together on 1 wave, but it doesn't. This one instead has Super Shadow ( ! ), with a re-release of modern Tails & Modern Knuckles. Knuckles and the Super Shadow come with a different color of chaos emerald, and the Tails has the star bumper this time. This is a winter 2021 release, and so far is only confirmed at TARGET IN STORE. (Why they don't put these on the website is unknown.

Sonic District vs. Waves
Generally the website would seperate the waves into "Classic" and "Modern" to better keep track of the figures, but because of their odd release-ways, that can't be done. So it's going to just stay as 'by size' with this page having only the larger figures no matter of classic/modern.

What's Accessory OK:
Re-releasing accessories with the various figures. Because distribution doesn't seem to be that great on these, it's nice to have another chance at a figure if you missed a wave completely. Remember, that star bumper originally came with modern Sonic, so now Tails has it. It's also possible to grab more emerald colors by getting the figures too. (Modern Sonic also has a purple emerald, and now the Knuckles fills in dark blue while Shadow's is red) Things like star-post, spikes, ring monitor etc. can be used as more than 1 to set up a Sonic scene on a shelf. The accessories make sense & are a good size.