Is funko Sonic classic or modern? His eyes aren't green but he's not very chubby so it can be both. What you see here is a combination item!
Funko brings a combo item to store shelves in the summer of 2018. These arcade cabinet shaped boxes contain a tee shirt & Funko pop Sonic figure. The 'screen' for the arcade shaped box has the modern logo, but a picture of Green Hill Zone. The front of the box has a picture of which tee you get since it can't be seen in the package. The back shows you which figure, and it is finger-waving Sonic.

The shirt itself is black with primary colors all-outlines design. It has Sonic's name, a row of rings & some 'floor' for him to be running on. However, the image on the tee is of funko pop styled Sonic so his head is super huge and he has the strange looking eye type. Photo by Taaron