I should have put up a reference for Eustace a while ago.

Eustace Sheep is a sheep of simple pleasures. He's naive, happy-go-lucky and hopelessly optimistic. He likes to play the ukelele and make up songs on the fly. He has a girlfriend who is a cat named Priscilla. He seems to exist in a kind of perpetual Depression-era setting. Despite that, he always tries to look on the bright side of life, even if he's often way in over his head.