Here is a fluffy, puffy Amy Rose keychain.
The SegaShop has this as a '25th Anniversary' item, but it doesn't use any 25th branding. It is a metal & enamel classic style Amy Rose face. She has her red headband, and the art is neoclassic. It shows her with her mouth open...but...her eyelids are white? Or has she somehow shut her pupils? Because both Amy & Sonic technically only have a single eye, how that eye is handled when it is closed can be a mystery for any artist or designer.
The other component of the chain is a fluffy / faux-furry pink pom-pom or puffball. Both are held together with the metal ring & loop for your keys. It has a spring-clip at the top so you can attach it to your main key chain. A plush/soft item keychain is good to collect, but less good to actually use because the faux fur can get dirty. However, the metal face is very good at resisting wear. This should be about 15 dollars at the SegaShop online.