Buddy

Keegan-Michael Key

Buddy / Dark Buddy (voice)

Cristin Milioti

Grace

Delaney Quinn

Freddy

Caleb Williams

Wade

Madison Skyy Polan

Hannah

Tristan Borders

Oliver

Patton Oswalt

Strappy (voice)

Jimmica Collins

Betty Bunny / Scared Flower (voice)

Eric Bauza

Mr. Mailbox / Worry Well / Couchy / Trashy / Pee Flower (voice)

Topher Grace

Ben

Bryson JonSteele

Derek

Seamus Flynn

Timothy

Luke Speakman

Josh

Bennie Taylor

Mailman Miles

Phuong Kubacki

Nurse Nancy

Devon Hawkes Ludlow

Charlie the Train (voice)