From left to right: Greece (child), Turkey (adult), Japan, Taiwan (holding panda), Korea (clinging child), China, Hong Kong, Finland (back), Sweden (adult), Sealand (child), United Kingdom, United States (child), Canada (child), Kumajirou (bear), France, Belarus, Russia, Ukraine, Liechtenstein, Switzerland, Southern Italy (Romano), Spain, Hungary, Austria (adult), Northern Italy (Veneziano, child), Germany (child), Prussia
I'm pretty sure they are all right, but feel free to correct any mistakes I have made.