Mayonnaise is a minor character of Inanimate School, a student of Inanimate School, and the manager of Burger Palace. He was a teenage friendly condiment who is best friends with Ketchup, Mustard, Salt, and Pepper. He is an enemy of Ruby who had called him "Poopy Mayonnaise". He is also a fisherman that usually catches fish on the Inanimate Harbor. He likes everyone except Ruby and her sisters. He takes care of his pet goldfish named Patrick. He is usually polite to everyone, but he is mean to Ruby. He is known to dislike the name "Poopy Mayonnaise", slapping Ruby who refer to him by the name "Poopy Mayonnaise". He is voiced by Tom Kenny, a voice actor who was known for voicing SpongeBob SquarePants.