Pud'n is an recurring supporter in The Grim Adventures of Billy & Mandy. He is a physically weak and easily terrified friend and classmate of Billy, Mandy, and Irwin who is often the victim and/or instigator of some terrible trauma. Pud'n is a red-headed, freckled, buck-toothed little boy who wears a hoodie and bursts into tears at the slightest provocation. Pud'n loves dollies, bunnies, flowers and many other "girly" things. He also has a severe allergy to pie. He is usually found hanging out with Billy and Irwin, being beaten up, or in class.
On rare occasions, Pud'n has shown defiance towards his persecutors and bullying potential, such as in "Tricycle of Terror" where he (along with Irwin) mercilessly taunted Billy, or in "A Grim Day" where he beat the snot out of General Skarr. It is revealed in the episode, "Spidermandy", that he lives next door to Billy, and is raised by wolves.
It is also revealed in "Billy and Mandy Moon the Moon", that he was an undercover agent for the moon people. In "Billy & Mandy: Wrath of the Spider Queen", it's shown his uncle is an astronaut (yet people don't care). He occasionally says "scout's honor" hinting that he is part of Scouts.