Here's a much better tee from Old Navy in 2019.
This all blue tee is in the kids/teens area, and features 8 character portraits, arranged around a large "Sonic the Hedgehog" label in big white font. You can see Sonic, Eggman, Tails, Amy, Shadow, Metal Sonic, Knuckles & Big the cat. Each one is full color, modern, and mostly in a rectangle.
To add interest, some parts of each character are allowed to overlap the boundary of the rectangle and out onto the shirt. This creates a fun 'comic-booky' effect and makes it look more full of action.
This is a nice tee for Egg-fans, or Metal Sonic as well, since they don't get to appear on merchandise as much as others. This IS an Old Navy exclusive, and it's their own brand in the collar tag.