Who are the characters from super diaper baby?

"Super Diaper Baby" features several key characters, including the titular Super Diaper Baby, a superhero infant with extraordinary powers. Other main characters include Captain Underpants, who is a humorous superhero alter ego of school principal Mr. Krupp, and the villainous Professor Poopypants. Additionally, the story includes characters like George and Harold, two mischievous kids who create comic books and get into various adventures. The book combines humor and superhero themes, appealing to young readers.