Playing Mikey Walsh
The Goonie who leads them to find One-Eyed Willie's treasure. Although Mikey suffers from asthma, he continually acts as the group's neverending supply of enthusiasm and spirit. It is his determination to save the Goon Docks that jumpstarts the film. Astin won a Young Artist Award for this role.
An obnoxious Goonie who tends to be a bit of a trickster. While he is treated as an annoyance often, Mouth is a boy of many talents including being perfectly fluent in Spanish and supposedly other languages.
Jonathan Ke Quan (credited: Ke Huy Quan)
An inventive Goonie who idolizes James Bond. Although many of his gadgets seem gimmicky and useless at first, they end up saving both the lives of the entire group and Data himself various times.
A fat Goonie who makes up stories and tries to pass them off as true. Although he seems to be the group burden, he comes through for everyone in the end by helping save the Goonies in a dire moment. A scene where Mouth denies Chunk entrance to their meeting unless he does the "Truffle Shuffle", namely lifting up his shirt and jiggling the fat on his body is a fan-favorite.
Playing Brand Walsh
Mikey's older brother who recently failed his driver's license test. A very strong young man, although he comes across as a typical overbearing older brother at first glance, he seems to genuinely care for his brother and the Goon Dock's dire situation.
A cheerleader who is dating Brand. Although jumpy and uncertain of the adventure she is swept up in, she often encourages the group. She saves the Goonies with her limited experience with piano from One-Eyed-Willie's most complex trap.
A friend of Andy is a smart-mouthed, skeptical girl. If not for the age difference she could be perfect foil for Mouth as the two butt heads very often. Although she comes across as something of a smart-alec, she demonstrates that she can be quite compassionate.
The full cast:
Sean Astin .... Mikey Walsh
Josh Brolin .... Brand Walsh
Jeff Cohen .... Lawrence 'Chunk' Cohen
Corey Feldman .... Clark 'Mouth' Devereaux
Kerri Green .... Andy Carmichael
Martha Plimpton .... Stef Steinbrenner
Jonathan Ke Quan .... Richard 'Data' Wang (as Ke Huy Quan)
John Matuszak .... Lotney 'Sloth' Fratelli
Robert Davi .... Jake Fratelli
Joe Pantoliano .... Francis Fratelli
Anne Ramsey .... Mama Fratelli
Lupe Ontiveros .... Rosalita
Mary Ellen Trainor .... Harriet Walsh
Keith Walker .... Irving Walsh
Curtis Hanson .... Elgin Perkins
Steve Antin .... Troy Perkins
Paul Tuerpe .... Sheriff
George Robotham .... Prison Guard
Charles McDaniel .... Jerry Cohen
Elaine Cohen McMahon .... Mrs. Cohen
Michael Paul Chan .... Mr. Wang
Nick McLean .... Mr. Devereaux (as George Nicholas McLean)
Bill Bradley .... Bill
Jeb Stuart Adams .... Troy's Friend #1
Eric Briant Wells .... Troy's Friend #2
Gene Ross .... Man in Shower #1
Max Segar .... Man in Shower #2
Newt Arnold .... Man in Shower #3 (as Newton Dennis Arnold)
Jack O'Leary .... Reporter #1
Patrick Cameron .... Reporter #2
Orwin C. Harvey .... Tennis Player (as Erwin Harvey)
Ted Grossman .... FBI Man
rest of cast listed alphabetically:
Richard Donner .... Policeman (uncredited)
Jennie Lew Tugend .... Mrs. Wang (uncredited)