Creator-themed mouse pads are ordinary desk mats with artwork printed on top, so judge them the same way: surface, size and how the edges are finished.
- Dimensions in inches, since a desk mat under the keyboard needs roughly 31 by 12 inches while a small pad is closer to 9 by 7.
- Surface texture, as cloth gives controlled glide and hard plastic feels faster under an optical sensor.
- Stitched edges and a rubber base, which stop curling and sliding during fast movements.
Check the listing itself for any licensing or artist credit rather than assuming a design is official.