Press Triangle when you are playing. Then press settings then unlockables (the key figure). You can find the unlockables in the toy chest and in the closet by typing the following codes.

Effect	Code
Angel Maine Coon and Angelic Wings	zficls
Ballerina Capuchin and Ballerina Outfit 2	ntrcds
Cowboy Orangutan, Cowboy Hat and Bandana	xwghio
Fairy Yorkie, Frilly Collar, Fairy Wings 2, Crown and access to Fairy Yorkie in the adoption center	qqqqqz
Superhero Husky, Star T-Shirt and access to Superhero Husky in the Adoption Center	vvbnnm
Unlocks Rockstar Boxer, Leather Jacket Suit, Spiked Collar 2 and gains access to the Rocksatr Boxer in the Adoption Center	uuuuuu
Unlocks Cheerleader White Persian, Cheerleader Outfit and Pom poms	abcdef
Unlocks Rocket Abyssinian and Rocket Pack	aarrgh