I finished all the character animation for this part but it lacks backgrounds. I may do that last. This will be part of a full color music video project including Sonic, Knuckles, Shadow, and Silver. Ivo and Metal sing to "Rokkugo" by SuJu as Shindong and Eunhyuk, respectively. The finger move Robotnik does and the crossover move towards the end are references to the original Rokugo video and live performances.
I gave Metal Sonic a mouth because I thought it gave him a little more personality and added some movement to his face. I don't think he has working eyelids either, but I gave him some of those too.
I'll probably make some more edits before the finale. Until then, enjoy.