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This is a list for the [[LoadsAndLoadsOfCharacters large and varied cast]] of Nickelodeon's ''WesternAnimation/HeyArnold''. There are plenty of unmarked spoilers throughout, so read at your own risk.
* [[Characters/HeyArnoldArnoldShortman Arnold Shortman]]
* [[Characters/HeyArnoldHelgaGPataki Helga G. Pataki]]
* [[Characters/HeyArnoldStudentsOfPS118 Students of P.S. 118]] [[labelnote:Click to Expand.]]Gerald Johanssen, Phoebe Heyerdahl, Rhonda Wellington Lloyd, Nadine, Harold Berman, Sid, Stinky Peterson, Eugene Horowitz, Lila Sawyer, Thaddeus "Curly" Gammelthorpe, Brainy, Sheena, Lorenzo, Iggy, Peapod Kid, Torvald, Wolfgang, Edmund, Ruth P. [=McDougal=], Patricia "Patty"/"Big Patty" Smith, Connie, Maria, Cookie and Simone, Chocolate Boy, Timberly Johanssen, The Campfire Lass[[/labelnote]]
* [[Characters/HeyArnoldTheAdults The Adults]] [[labelnote:Click to Expand.]]Philip "Steely Phil" Shortman, Gertrude "Gertie" (aka Pookie) Shortman, Miles and Stella Shortman, Mitzi Shortman, Oskar Kokoshka, Suzie Kokoshka, Ernie Potts, Mr. Hyunh, Robert "Big Bob" Pataki, Miriam Pataki, Olga Pataki, Martin Johanssen, Mrs. Johanssen, Mr. Robert Simmons, Principal Rur Wartz, Miss Slovak, Willie (aka. The Jolly Olly Man), Harvey the Mailman, Mr. Marty Green, Dino Spumoni, Coach Jack Wittenburg, Tish Wittenberg, Rex Smythe-Higgins, Monkeyman, Vincent (aka. The Pigeon Man), Nick Vermicelli, Alphonse Perrier du von Scheck, Bridget, Dr. Bliss, Ronnie Matthews[[/labelnote]]
* [[Characters/HeyArnoldOtherKids Other Kids]] [[labelnote:Click to Expand.]]Arnie, Rex Smythe-Higgins III, Ludwig, James "Jamie O" Johanssen, Stoop Kid, Summer[[/labelnote]]