Characters
- Billy Hoskins/Super Diaper Baby - is the book's protagonist; he is a newborn baby who gains Captain Underpants' powers.
- Danger/Diaper Dog - is the Hoskins pet and Super Diaper Baby's sidekick.
- Deputy Dangerous/Doo-Doo - is the main antagonist of the book. He invents the Danger Crib 2000 to steal Super Diaper Baby's powers, the Robo-Ant 2000, and owns the Ye Old Underwear Laundry. He becomes a piece of poop due to a mishap in one of his attempts to steal Super Diaper Baby's powers and grows huge when he gets dumped in radioactive waste. After he is defeated, he is dumped on Uranus.
- Bill Hoskins - Billy's father.
- Mary Hoskins - Billy's mother.
- Dr. Dilbert Dinkle/Rip Van Tinkle - is the main antagonist of Super Diaper Baby 2. He once was a criminal/inventor. He is accidentally shot by Petey, turning him into water, Petey drinks him, turning him into pee. He is froze solid later and is left on Uranus along with the wrapped Deputy Doo-Doo.
- Petey - is a grumpy cat. Petey dislikes Rip Van Tinkle's attitude and bad breath. He is the controller of the Robo Kitty and Supa - Mecha Kitty 3000. After he sniffs cat nip, he goes mentally crazy. He is dropped off at a prison for cats. Later, he appears in Captain Underpants and the Terrifying Re-Turn of Tippy Tinkletrousers in the Comic ""The Adventures of the Dog Man"".
Read more about this topic: The Adventures Of Super Diaper Baby
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“White Pond and Walden are great crystals on the surface of the earth, Lakes of Light.... They are too pure to have a market value; they contain no muck. How much more beautiful than our lives, how much more transparent than our characters are they! We never learned meanness of them.”
—Henry David Thoreau (1817–1862)