• Mario as George Beard
  • Yoshi as Harold Hutchins
  • Luigi as Captain Underpants
  • Baby Mario as Sulu the Hamster
  • Baby Luigi as Crackers the Pterodactyl
  • Kamek as Melvin Sneedly
  • Bowser as Mr. Krupp
  • Wario as Mr. Meaner
  • Waluigi as Mr. Rected
  • Captain Syrup as Mrs. Ribble
  • Princess Shroob as Mrs. Anthrope
  • Rosalina as Mrs. Guided
  • Antasma as Mr. Rustyworthy
  • Mouser as Dr. Diaper
  • Diddy Kong as Mr. Fyde
  • Peach as Jessica Gordon
  • Birdo as Stephanie Yarkoff
  • Ludwig "Kooky" Von Koopa as Professor Poopypants
  • Oogtar as Tim Bronski
  • Kiddy Kong as Stevie Loopner
  • Baby Bowser as The Bionic Booger Boy
  • Funky Kong as George's Dad
  • Candy Kong as Harold's Mom
  • Toad as Harold's Grandpa
  • Toadette as George's Grandma
  • Bowser Jr. as Captain Blunderpants
  • Lemmy "Hip" Koopa as Evil George
  • Iggy "Hop" Koopa as Evil Harold
  • Larry "Cheatsy" Koopa as Evil Sulu
  • Morton "Big Mouth" Koopa Jr. as Robo-George
  • Roy "Bully" Koopa as Robo-Harold
  • Marilyn, Beldam and Vivian as Korx, Klax and Jennifer
  • Smithy as Dinosaur
  • Bowser's Minions as Other Kids

Version 2

  • Yoshi as George Beard
  • Toad as Harold Hutchins
  • Wario as Captain Underpants
  • Kamek as Melvin Sneedly
  • Bowser as Mr. Krupp
  • Kammy Koopa as Mrs. Ribble
  • Cackletta as Mrs. Anthrope
  • Bowser Jr. as Mr. Meaner
  • Mario as George's Dad
  • Peach as Harold's Mom
  • Luigi as Harold's Grandpa
  • Daisy as George's Grandma
  • Shadow Mario as Captain Blunderpants
  • Blue Koopa Kid as Evil George
  • Green Koopa Kid as Evil Harold
  • Red Koopa Kid as Evil Sulu
  • Lemmy "Hip" Koopa as Robo-George
  • Iggy "Hop" Koopa as Robo-Harold

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