Leah Lewis Ember Lumen (voice) Mamoudou Athie Wade Ripple (voice) Ronnie del Carmen Bernie Lumen (voice) Shila Ommi Cinder Lumen (voice) Wendi McLendon-Covey Gale (voice) Catherine O'Hara Brook Ripple (voice) Mason Wertheimer Clod (voice) Ronobir Lahiri Harold (voice) Joe Pera Fern (voice) Matthew Yang King Alan / Lutz / Earth Pruner (voice) Jonathan Adams Flarry (voice) Alex Kapp Customer / Delivery Person / Earth Landlord (voice) P.L. Brown Doorman (voice)