Here are some classic fun glittery stickers! These sticker sets are by Sanrio, and likely came out around the time of Sonic 1. They feature enemies like Ball Hog, Crab Meat, Roller and Chop Chop as well as Eggman, animals and of course plenty of Sonic. Each sticker set seems to share the same speckled foil backing (seen most clearly on right-side set). On the back of each card is an extra for you, with games, mazes, character profiles & more. It appears each set cost 100 yen at the time of release. (Note that the Sonic with Bike image is from the early Japan Sonic ScreenSaver set of professional artwork.

These seem to belong to the same set as the Holofoil SegaSonic sticker.