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)