Anna Cathcart
— Olympia
Isaac Kragten
— Otis
Millie Davis
— Ms. O
Olivia Presti
— Oona
Christian Distefano
— Owen
Alexander Fonseca
— Chuck Shmumbers
Elena Juatco
— Hiccups Lady
Amy Khou
— Odena
Joshua Kilimnik
— Odd Todd
Parker Lauzon
— Trumpet Agent
Tristan Ly
— Osmand
Tony Sciara
— Gino Confalone
Chris River
— Dramatic Kid Announcer (as Christopher River)
Tate Yap
— O'Donahue
Kaitlyn Yu
— Patternista / 80's Ms. O
Anand Rajaram
— Mr. Fonts
Sean Sullivan
— Man with Rain Problem
Kevin Whalen
— Man with Future Toast
Christian Dal Dosso
— Odd Todd Guard (uncredited)