Milt Appleday is Sonny's dad. He passed away before the events of the film, and his brain was given to Jimmy.
Milt is often seen wearing a grey suit with a brown tie around his neck. Underneath, he wears a white dress shirt with a folded collar. He has short black hair and a somewhat thick black mustache.
Because of Jimmy's ability to see the characters Milt created, it is implied that Milt might have had a mental illness that caused him to see his characters. He was also a very imaginative person who had created loveable characters that have become world famous.
- He is a parody of Walt Disney and The Warner Brothers Studio president.