These are the animals that the players can control. Gameplay-wise there is no difference between them, they only differ in appearance, sounds and have different outfits. There are ten characters in total: Chicken, Horse, Raccoon, Sheep, Chameleon, Squirrel, Bunny, Elephant, Monkey, and Snake.
Which of the characters are available to be used depends on the unlocks of the host of a game. For example: Player B who has already unlocked all of the characters joins the lobby of Player A. However, because Player A has not unlocked any of them yet, only the standard animals are available. Similarly, if Player B was the host instead and Player A joined his game, they could choose from all ten characters.