Noah Schnapp
Charlie Brown (voice)

Bill Melendez
Snoopy / Woodstock (voice) (archive sound)

Marleik 'Mar Mar' Walker
Franklin Armstrong (voice)

Alex Garfin
Linus (voice)

Hadley Belle Miller
Lucy van Pelt (voice)

Rebecca Bloom
Marcie (voice)

Anastasia Bredikhina
Patty (voice)

Venus Schultheis
Peppermint Patty (voice)

A.J. Tecce
Pigpen (voice)

Mariel Sheets
Sally Brown (voice)

Noah Johnston
Schroeder (voice)

William Wunsch
Shermy (voice)

Madisyn Shipman
Violet Grey (voice)

Kristin Chenoweth
Fifi (voice)

Trombone Shorty
Miss Othmar / Mrs. Little Red-Haired Girl (voice)

Francesca Capaldi
The Little Red-Haired Girl / Frieda (voice)

Holly Dorff
Various Voices (voice)

Al Nelson
Various Voices (voice)

Tessa Netting
Various Voices (voice)

Randy Thom
Various Voices (voice)

Nikolas Bravos
Group Voices (voice)

Sam Lavagnino
Group Voices (voice)

Dylan Naber
Group Voices (voice)

Aramé Scott
Group Voices (voice)