Milkman is a superhero in Pajama Sam 2: Thunder and Lightning Aren't So Frightening.
He gets shaken with Hero Sandwich, Clementine and Captain Gelatin, causing the milk and his hat to fly off by an earthquake in the intro but after all the milk stains were dried off and his hat was back on his head he celebrated his victory in the end credits.
According to Milkman's trading card, Milkman likes coconut milk.