This is a dangler.
They are commonly used to stick to surfaces inside of cars. The wire from the suction cup is memory-wire so as the item it's stuck to moves, the figure on the end sways around and dangles. The Sonic is SA style and fully 3D. You may recognize the figure, as it was also used (on a base) as a keychain. You can also stick these to windows or mirrors in your home. In this example, it is stuck to the inside of a Sonic themed thin case. The case is metal, and the interior may also serve as a mirror.