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[[caption-width-right:350:And that's not even half of them!]]

!WARNING: There are plenty of unmarked spoilers throughout (spoilers from ''WesternAnimation/HeyArnoldTheJungleMovie'' WILL be marked as necessary), so read at your own risk.

This is a list for the [[LoadsAndLoadsOfCharacters large and varied cast]] of Nickelodeon's ''WesternAnimation/HeyArnold''.
* [[Characters/HeyArnoldStudentsOfPS118 Students of P.S. 118]]
** [[Characters/HeyArnoldArnoldShortman Arnold Shortman]]
** [[Characters/HeyArnoldHelgaGPataki Helga G. Pataki]]
** [[Characters/HeyArnoldStudentsOfPS118MrSimmonsClass Mr. Simmons' Class]] [[labelnote:Click to Expand]]Gerald Martin Johanssen, Phoebe Heyerdahl, Rhonda Wellington Lloyd, Nadine, Harold (aka. Chaim) Berman, Sid, Stinky Peterson, Eugene Horowitz, Lila Sawyer, Thaddeus "Curly" Gammelthorpe, Brainy, Sheena, Lorenzo, Iggy, Peapod Kid, Torvald[[/labelnote]]
** [[Characters/HeyArnoldStudentsOfPS118OtherStudents Other Students]] [[labelnote:Click to Expand]]Wolfgang, Edmund, Ruth P. [=McDougal=], Patricia "Patty"/"Big Patty" Smith, Connie, Maria, Cookie and Simone, Chocolate Boy, Timberly Johanssen, The Campfire Lass, Big Gino[[/labelnote]]
* [[Characters/HeyArnoldTheAdults The Adults]]
** [[Characters/HeyArnoldTheAdultsPartOne Part 1]] [[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, Miss Felter[[/labelnote]]
** [[Characters/HeyArnoldTheAdultsPartTwo Part 2]] [[labelnote:Click to Expand.]]Willie (aka. The Jolly Olly Man), Harvey the Mailman, Mr. Marty Green, Dino Spumoni, Don Reynolds, Coach Jack Wittenburg, Tish Wittenberg, Rex Smythe-Higgins I, Monkeyman, Vincent (aka. The Pigeon Man), Nick Vermicelli, Liechliter, Mrs. Vitello, Eduardo, Lasombra, Alphonse Perrier du von Scheck, Bridget, Dr. Bliss, Ronnie Matthews, Maurice, Jimmy Kafka, Agatha Caulfield[[/labelnote]]
* [[Characters/HeyArnoldOtherKids Other Kids]] [[labelnote:Click to Expand.]]Arnie, Rex Smythe-Higgins III, Ludwig, James "Jamie O" Johanssen, Stoop Kid, Summer, Frankie G., Tucker Wittenberg[[/labelnote]]