A drawing I did and uploaded onto DeviantArt on Jan 4, 2014.
I'm posting old art that I loved here as well.

Old Description from the site:
Alternate title: "Mighty on Guard and Knuckles on Break"
https://www.colorslive.com/painting/1799295

This is my idea of why Mighty the armadillo isn't present in the games as well as how Knuckles can hang out with Sonic without worrying about the Master Emerald too much. This pic took a long time to draw, but that's due to figuring out how to do the background.