Pud'n is a red-headed, freckled, buck-toothed little boy who wears a hoodie.
He 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.
Pud'n has been known to be socially awkward like not using a traditional bathroom in school but peeing in the corner. He also been known to chew and put things in his mouth to objects like books and other things.
On rare occasions, Pud'n has shown defiance towards his persecutors and bullying potential, such as inTricycle 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.
He is rather dim-witted, sometimes even managing to surpass Billy's stupidity. For instance, he is shown to sometimes fail to use the restroom when he needs to go, instead, peeing by a garbage can, in Wrath of the Spider Queen. He also mistakes Thromnambular for candy, and one of Billy's Dinobonoids for a shiny cupcake.
- Pud'n's roar sounds like the T-Rex from Jurassic Park.
- He occasionally says "scout's honor" hinting that he is part of Scouts.
- In "Billy & Mandy: Wrath of the Spider Queen", it's shown his uncle is an astronaut (yet people don't care).
- It is also revealed in "Billy and Mandy Moon the Moon", that he was an undercover agent for the moon people.