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))

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))

Evan Agos

(Ellingboe Boy (voice))

Matthew McCann

(Additional Kids Voices (voice))

Hudson West

(Additional Kids Voices (voice))

Joaquin Obradors

(Boy (voice))