Watak dan suara Hey Arnold!

dari kiri Helga Pataki, Arnold, dan Gerald Johanssen.
  • Arnold - (Toran Caudell, Phillip Van Dyke, Spencer Klein, Alex D. Linz)
  • Gerald Martin Johanssen - (Jamil Walker Smith)
  • Helga G. Pataki - (Francesca Smith a.k.a. Francesca Marie Smith)
  • Harold Berman - (Justin Shenkarow)
  • Phoebe Hyerdahl - (Anndi McAfee)
  • Rhonda Wellington Lloyd - (Olivia Hack)
  • Stinky Peterson - (Christopher P. Walberg, Toran Caudell in "Downtown as Fruits")
  • Sheena - (Francesca Smith a.k.a. Francesca Marie Smith)
  • Eugene Horowitz - (Christopher Castile, Jarrett Lennon, Ben Diskin, Blake Ewing)
  • Phil (Datuk Arnold) - (Dan Castellaneta, Bradford LaPerous)
  • Gertie (Nenek Arnold) - (Tress MacNeille)
  • Stella (Mak Arnold) - (Antoinette Stella)
  • Miles (Ayah Arnold) - (Craig Bartlett)
  • Brainy - (Craig Bartlett)
  • Wolfgang - (Toran Caudell)
  • Ludwig - (Phillip Van Dyke)
  • Iggy - (Tress MacNeille)
  • Big Bob Pataki - (Maurice LaMarche)
  • Myriam Pataki - (Kath Soucie)
  • Oskar Kokoschka - (Oskar Kokoschka)
  • Suzie Kokoschka -
  • Earnie Potts -
  • Dino Spumoni - (Rick Corso)
  • Ruth McDougal -
  • Mickey Kaline -