Klaus

Jason Schwartzman

Jesper (voice)

J.K. Simmons

Klaus (voice)

Rashida Jones

Alva (voice)

Joan Cusack

Mrs. Krum (voice)

Norm Macdonald

Mogens (voice)

Will Sasso

Mr. Ellingboe (voice)

Sergio Pablos

Pumpkin / Olaf (voice)

Mila Brener

Ellingboe Girl 3 (voice)

Neda Margrethe Labba

Margu (voice)

Sydney Brower

Ellingboe Girl (voice)

Teddy Blum

Small Ellingboe Boy (voice)

Julian Zane

Krum Boy (voice)

Emma Shannon

Creepy girl 1 (voice)

Kendall Joy Hall

Annelise (voice)

Sky Alexis

Ellingboe Girl 2 (voice)

Tucker Meek

Ellingboe Boy / Krum Boy (voice)

Amanda Philipson

Ellingboe Councilwoman (voice)

Finn Carr

Ellingboe Boy 1 (voice)

Lucian Perez

Krum Boy / Creepy Boy 2 (voice)

Emma Yarovinsky

Little Krum Girl (voice)

Jaeden Bettencourt

Krum Boy / Jesper Son (voice)

Hailey Hermida

Krum Girl 1 (voice)

Evan Agos

Ellingboe Boy (voice)

Leo Miller

Ellinboe Boy 5 (voice)

Bailey Rae Fenderson

Creepy Girl 2 (voice)

Ayden Soria

Creepy Boy 1 (voice)

Reiulf Aleksandersen

Adult Saami (voice)

Matthew McCann

Additional Kids Voices (voice)

Hudson West

Additional Kids Voices (voice)

Joaquin Obradors

Boy (voice)