Name	Known for
Henry Winkler Arthur 'Fonzie' Fonzarelli Arthur 'Fonzie' Fonzarelli See fewer	The Waterboy (1998)
Marion Ross Marion Cunningham Marion Cunningham See fewer	Superhero Movie (2008)
Cathy Silvers Jenny Piccalo Jenny Piccalo See fewer	Follow That Bird (1985)
Ted McGinley Roger Phillips Roger Phillips See fewer	Revenge of the Nerds (1984)
Linda Purl Ashley Pfister Ashley Pfister See fewer	Mighty Joe Young (1998)
Tom Bosley Howard Cunningham Howard Cunningham See fewer	Happy Days (1974)
Erin Moran Joanie Cunningham Joanie Cunningham See fewer	Joanie Loves Chachi (1982)
Scott Baio Chachi Arcola Chachi Arcola See fewer	Superbabies: Baby Geniuses 2 (2004)
Crystal Bernard K.C. Cunningham K.C. Cunningham See fewer	Wings (1990)
Pat Morita Matsuo 'Arnold' Takahashi Matsuo 'Arnold' Takahashi See fewer	The Karate Kid (1984)
Brad Blaisdell Lou Lou See fewer	Inspector Gadget (1999)
Judy Pioli Phyllis Phyllis See fewer	Valerie (1986)
Rick Dano Felix (as Richard Dano) Felix (as Richard Dano) See fewer	Big Wednesday (1978)
Ronnie Sperling Phil Phil See fewer	Mighty Morphin Power Rangers (1993)
April Audia Singer Singer See fewer	John Mulaney Presents: Everybody's in LA (2024)