Characters: Horton Hears a Who!

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Jungle of Nool

    Horton the Elephant 
Voiced by: Kent Rogers (1st, Horton Hatches the Egg cartoon), Hans Conried (1970 TV Special), Jim Carrey (2008 animated film)

    Jane Kangaroo 
Voiced by: Carol Burnett

    Morton the Mouse 
Voiced by: Seth Rogen

    Rudy Kangaroo 
Voiced by: Chuck Jones (1970 TV Special); Josh Flitter (2008 animated film)

    Vlad Vladikoff 
Voiced by: Will Arnett


    Mayor Nedd McDodd 
Voiced by: Steve Carrell (2008 animated film)

    Sally O' Malley 
Voiced by: Amy Poehler

    Dr. Mary Lou LaRue 
Voiced by: Isla Fisher

    JoJo McDodd 
Voiced by: Jesse McCartney

  • Ascended Extra: In the book, he was brought in as a last resort to save Whoville. In the movie, he's a much more prominent character and in the Seussical, he's the protagonist.
  • Big Little Brother: He is the next mayor because he is the oldest, but he is smaller than all of his sisters.
  • Brainy Brunette: Of the making music variety.
  • Breakout Character: Even with his limited amount of screentime, JoJo quickly gained popularity with the fans.
  • Dark Is Not Evil: His color schemes are black and white and he's the tritagonist.
  • Gadgeteer Genius: JoJo filled the abandon observatory with castaway items and set up an elaborate system to produce music.
  • Hidden Depths: "But he's anything but silent. He hears music in the tapping of an old keyboard, feels the beat in the rhythmic bounce of a basketball and finds harmony in wind whistling over a comb."
  • Outnumbered Sibling: He has 96 sisters and is the only boy.
  • The Quiet One: See "Well Done, Son!" Guy.
  • Tritagonist: To Horton's protagonist and his father's Deuteragonist.
  • "Well Done, Son!" Guy: "JoJo is so worried that he'll say something to disappoint his father that he finds it best not to speak- ever."