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)