Kind-hearted 9-year-old boy who leads efforts to save his neighborhood and find his parents.
Phil provides family history and practical support.
Arnold's grandfather Phil tells him about the Tomato Incident and helps the residents devise a plan against the bulldozers.
Gerald is Arnold's closest friend and practical partner.
Arnold and his best friend Gerald learn about FTI's redevelopment plan together and repeatedly act as a team to save the neighborhood.
Gertie is Arnold's protective grandmother and a defender of the neighborhood.
The plot identifies Gertie as Arnold's grandmother, and she is arrested while resisting the police suppression of the neighborhood rally.
Arnold's preservation campaign directly opposes Scheck's redevelopment scheme.
Arnold leads the effort to stop Scheck's plan to demolish the neighborhood and replace it with a luxury high-rise shopping mall.
Bridget provides operational assistance during the decisive mission.
Bridget aids Arnold and Gerald during their infiltration of FTI headquarters, and later helps Arnold present the security footage on the jumbotron.
Marty delivers the information that initiates Arnold's campaign.
Arnold and Gerald learn about FTI's redevelopment announcement from butcher Marty Green after returning from their basketball defeat.
Explore the full interactive character relationship map of Hey Arnold! The Movie
Related entry on Wikidata (Q2863338), public domain (CC0).