The made-to-match Target Sonic bed items all come in similarly themed packages, as seen above. The website will only show you the right-side photo, not what they will look like when you find them on shelves. These ONLY fit TWIN beds. There is no single or full-bed option, which is unfortunate because not everyone's bed is the same size. The comforter comes in a zip top plastic case & is called "Cotton Rich Twin Comforter". The sheets are exposed partially & come in a cardboard sleeve.

They are called "Twin Sheet Set". With that set you get Fitted 39 x 75 , flat sheet 66 x 96 & 1 pillow case 20 x 26. Notice that the pillow case has 2 sides (shown as 2 pillows on the card, though you only get 1 case per set) The dots on the package say "Pre-Washed" and "Ultra Soft". These are made & licensed by Franko NewJersey but were made in Pakistan (somehow?) All the art here is CG & modern. The comforter has Sonic, Shadow, Knuckles & Tails, all running mostly toward the viewer. Any of the shots of this make it hard to see the whole design at once.
The sheets are 21.99 and the comforter is 32.99. Target is also known to have sales, so keep an eye on these if you want them! It should also be noted that in the same area you may find a plush Sonic doll, though he is called "A Pillow" though it isn't one. The doll can be seen on SonicGear plushes.