Characters : Olivia 'Via' Pullman

Actor : Izabela Vidovic

Characters : Lawrence Tushman

Actor : Mandy Patinkin

Characters : Thomas Browne

Actor : Daveed Diggs

Characters : Jack Will

Actor : Noah Jupe

Characters : Julian Albans

Actor : Bryce Gheisar

Characters : Miranda Navas

Actor : Danielle Rose Russell

Characters : Charlotte Cody

Actor : Elle McKinnon

Characters : Summer Dawson

Actor : Millie Davis

Characters : Ms. Petosa

Actor : Ali Liebert

Characters : Justin Hollander

Actor : Nadji Jeter

Characters : Amos Conti

Actor : Ty Consiglio

Characters : Miles Noury

Actor : Kyle Harrison Breitkopf

Characters : Henry Joplin

Actor : James A Hughes

Characters : Mrs. Will

Actor : Nicole Oliver

Characters : Mrs. Navas

Actor : Rachel Hayward

Characters : Melissa Albans

Actor : Crystal Lowe

Characters : Julian Albans, Sr.

Actor : Steve Bacic

Characters : Mr. Davenport

Actor : Ben Ratner

Characters : Grandma

Actor : Sônia Braga

Characters : Reid Kingsley

Actor : Izzy Lieberman

Characters : Rebecca

Actor : Hannah Hoberman

Characters : Ella

Actor : Erika McKitrick

Characters : Savanna Wittenberg

Actor : Lucia Thain

Characters : Ximena Chin

Actor : Emily Delahunty

Characters : Maya Markowitz

Actor : Sasha Neuhaus

Characters : Eddie Johnson

Actor : William Dickinson

Characters : Danny

Actor : Armen Bagdasarov

Characters : Michelle

Actor : Emma Tremblay

Characters : Lina Annan

Actor : Lidya Jewett

Characters : Angela

Actor : Kaelyn Breitkopf

Characters : Rebecca Gibbs

Actor : Emily Giannozio

Characters : Mrs. Gibbs

Actor : Haley Goldin

Characters : James

Actor : Cameron Roberts

Characters : Wally

Actor : Grayson Maxwell Gurnsey

Characters : Young Olivia

Actor : Maccie Margaret Chbosky

Characters : Daisy

Actor : Gidget

Characters : Science Fair Judge

Actor : Victoria Cruz

Characters : Julian's sister

Actor : Laura Mozgovaya

Characters : Musical Theatre Student (voice)

Actor : Darcy Rose Byrnes

Characters : School Photographer

Actor : Jason McKinnon

Characters : Classmate

Actor : Brayden Snow

Characters : Additional Voices (voice)

Actor : Brooke D. Singleton

Characters : School Kid

Actor : Andre Robinson

Characters : School Kid

Actor : Alyssa Andronyk

Characters : Camp Counsellor

Actor : Jason Tremblay

Characters : Simon Stimson

Actor : Wilson Chieng

Characters : Classmate

Actor : Dallas Snow

Characters : Classmate

Actor : Justin Snow

Characters : Classmate

Actor : Kayzhia Snow

Characters : Classmate Parent

Actor : Amber Snow

Characters : Classmate

Actor : Elayna Sing

Characters : Parent

Actor : Ann Evans

Characters : Doogie Howser (uncredited)

Actor : Mark Dozlaw

Characters : Daughter at Coney Island Beach (uncredited)

Actor : Abigail Friend

Characters : Boy in red (uncredited)

Actor : Razvan Orban

Characters : Parent (uncredited)

Actor : Kari Staten

Characters : Grans (as Sonia Braga)

Actor : Sônia Braga

Characters : Additional Voice

Actor : Sean Ryan Fox