Carbon Costume 
Gerald Johanssen
Gerald Johanssen is Arnold’s fellow student and best friend in “Hey Arnold!” He is a good kid just like Arnold, however often has less patience than his football-headed companion.
Sid from Hey Arnold!
Sid is one of Arnold’s classmates and best friends with Stinky and Harold. While not necessarily a bad kid, he is a bit of a troublemaker and has extreme paranoid tendencies. His pride and joy are his white winklepicker beatle boots.
Stinky Peterson
In Hey Arnold!, Stinky Peterson is one of Arnold’s classmates and a bit of a social pariah. Despite living in the city, he hails from a “country” family and his accent reflects this. Despite this, Stinky refuses to be a stereotype and is actually quite intelligent, while also maintaining a high level of personal integrity.
Harold Berman
Harold is the resident bully among his classmates in “Hey Arnold!” However, he is frequently shown to have a sensitive side and is even quite insecure. His best friends are Stinky and Sid, and the trio often cause trouble around P.S. 118 and rest of the city.
Arnold Shortman in Hey Arnold!
Arnold is calm and upbeat with an overall optimistic personality. He often goes out of his way to help others and has a gift for advising others. Throughout the series he has a number of one-sided crushes that would give Taylor Swift a run for her money. While it may be a bit of stretch to reshape your head into a football, you can certainly reshape the wig into the right hairstyle.
Helga G. Pataki
In Hey Arnold!, Helga Geraldine Pataki is a 4th grader who can be bossy and a bit of a tomboy. She’s secretly in love with Arnold, but shows it by teasing him as little children do.
