Easily one of my favourite renders that I've ever done, this is (resized to avoid it taking forever to upload) a heavily modified version of the original Chaos model from Sonic Adventure DX. I managed to (relatively quickly) rig the model myself, posed him, and then worked on his materials. I wasn't really sure how to replicate the same kinda look he has in the game (with his brain clearly visible), so I just did my best here. The background uses the same texture as Chaos' body, so, that's why it looks so glossy and reflective.
What I'd really like to do, if I ever actually get down to texturing the Adventure Fields, is make a little animated series based on the game, set perhaps during the events that occured after Sonic Adventure, but before Sonic Adventure 2. This would give me an excuse to work more on rigging and also give me a little more experience in animating for more than just experimental purposes. I'd obviously have to find voice actors/actresses, but what else is Reddit for?
Anyway, this render has 1,044 samples (the most I've ever used), and it took about an hour to render. It obviously didn't do me much good, because there is a ton of noise visible. It's most likely because of all the fancy lighting and reflective materials, but it kinda ruins it in my opinion. That being said, I'm super happy with every other aspect of it and hope you guys like it as much as I do (it took bloody long enough).