This is a strap, keyholder, or charm.
Here's a great warehouse find from 2002: Shinobu, with a base to stand on! We have very few, so act fast!
Please note that figures such as this are mass produced and as a result some inconsistencies in finish and painting may occur; these are not considered manufacturer's defects. If you absolutely must have perfection, prepare to do some touch-up work on your own.