Here's an old Sonic keychain.
This one is in a sort of "Chibi" style, with no legs (!) and very small arms/hands and feet. The head is quite big, but the earys are extra small. However, the most curious feature (aside from the no legs, but feet) is the mouth is in the front, rather than off to one side. It looks pretty natural though, so they've done a good job. The combination of all these features gives it a rather oldskool /cartoony look. The chain and key-clip seem to be all plastic as well, which does not make it very sturdy. Probably good to collect, rather than to use.