"Bloo": Mac's original imaginary best friend,he is five years old. Bloo is cute and smart and loves breaking the rules and causing trouble. Once he had to think if he liked making people's life miserable when confronted by Mac. Bloo likes to take advantage of the friends at Foster's and is constantly working on his scamming and loves to eat. He insists that he is pure blue, even though technically, he is Cornflower Blue. Bloo thinks it's "The Law" that no one is allowed in the mall without cash.