<Li> Stinky Peterson (sometimes spelled Petersen) (voiced by Christopher Walberg in the series, Jet Jurgensmeyer in The Jungle Movie)--Stinky is a tall and lanky friend of Arnold's whose family is from Arkansas, and he is also one of Harold's best friends . Stinky has a Southern accent and a love for lemon pudding . His friendship with Harold had him originally portrayed in the first season as a bully who wore spiked wristbands and sidekick of Harold's, though the former was later de-emphasized and he was reinvented as a more affectionate, mild mannered and romantic character viewed as the class "ladies man", as he's romantically attracted to several female characters . He's shown to make up excellent poems while Phoebe was feeling depressed . </Li> <Li> Sid (voiced by Sam Gifaldi in most episodes, Taylor Gifaldi in "April Fool's Day", and Aiden Lewandowski in The Jungle Movie)--A friend of Arnold and one of Harold's best friends with paranoid tendencies . He is always shown wearing a green baseball cap backwards, a black leather jacket, jeans and a pair of white Beatle boots . He often tells urban legends, with or without the assistance of Gerald . Perhaps his most well - known characteristic is that he typically ends up in ridiculous situations, such as becoming severely mysophobic, deciding to devote his life to Arnold after Arnold saves his life, and believing Stinky is a vampire, among other things . </Li> <Li> Rhonda Wellington Lloyd (voiced by Olivia Hack)--A rich, pompous, self - proclaimed fashion queen and friend of Arnold . She is one of the most popular students attending P.S. 118 . Both of her parents are stereotypically preppy . Even though she is always seen concerned about her style, Rhonda is a phenomenal athlete, practicing numerous contact sports, like baseball and football, not caring if she ruins her clothes or accessories . </Li> <Li> Eugene Horowitz (voiced by Christopher Castile, then Jarrett Lennon in season 1, then Benjamin Diskin for seasons 2--4, Blake McIver Ewing in season 5 and the movie and Gavin Lewis in The Jungle Movie)--A somewhat socially inept but optimistic friend of Arnold, the class jinx . Eugene is prone to several forms of misfortune and is often bullied . He believes Arnold is a jinx due to several of his past tragedies having occurred in Arnold's presence . It's implied that he has a crush on Sheena . </Li>

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