• 
  Jun Fukushima

  Gum-kun
• 
  Yukiyo Fujii

  Kyoko
• 
  Lynn

  Sakura Yamauchi
• 
  Shinichirô Miki

  Father
• 
  Atsuko Tanaka

  Mother
• 
  Mahiro Takasugi

  I
• 
  Yuma Uchida

  Takahiro
• 
  Emi Wakui

  Sakura no haha (voice)

• 
  Kira Buckland

  Kyoko (voice)
• 
  Kyle McCarley

  Takahiro (voice)
• 
  Robbie Daymond

  'Me' (voice)
• 
  Erika Harlacher

  Sakura Yamauchi (voice)
• 
  Dorah Fine

  Sakura's Mother (voice)
• 
  Ryan Bartley

  Additional Voices (voice)
• 
  Xanthe Huynh

  Additional Voices (voice)

• 
  Erica Mendez

  Additional Voices (voice)
• 
  Khoi Dao

  Gum Boy (voice)
• 
  Patrick Seitz

  Father
• 
  Laura Megan Stahl

  Additional Voices