Leah Lewis Ember (voice) Mamoudou Athie Wade (voice) Ronnie del Carmen Bernie (voice) Shila Ommi Cinder (voice) Wendi McLendon-Covey Gale (voice) Catherine O'Hara Brook (voice) Mason Wertheimer Clod (voice) Ronobir Lahiri Harold (voice) Wilma Bonet Flarrietta (voice) Joe Pera Fern (voice) Matthew Yang King Alan / Lutz / Earth Pruner (voice) Clara Lin Ding Little Kid Ember (voice)