A simple, pale-yellow-colored friend who debuted in "Mac Daddy". Cheese was thought to be an imaginary friend accidentally created by Mac, but was actually created by Mac's neighbor Louise. He appears to be somewhat madcap and dim-witted, often saying incoherent or non-sequitur phrases, and breaking into sudden bouts of screaming when frightened or when he doesn't get his way. Cheese likes goldfish crackers, cereal, juice, chocolate milk (although he is lactose-intolerant), and so on. His name can be paired off with other characters' names to make puns-of-sorts ("Mac and Cheese"/ Macaroni and cheese, "Bloo Cheese"/ blue cheese, "Cheese and Crackers," and "Cheese Louise"/ the expression "Geez Louise!"). In the series finale "Goodbye to Bloo", he becomes the newest resident at Foster's, much to the other residents' surprise/horror. Cheese is always considered to be an annoyance, but is treated like a friend by Mac's friends in "Infernal Slumber". He is voiced by Candi Milo.