Suggestions by @rockscar

Margot Robbie

as Glinda in The Wizard of Oz

Brian Tyree Henry

as The Cowardly Lion in The Wizard of Oz

Adrien Brody

as The Tin Man in The Wizard of Oz

Joseph Quinn

as The Scarecrow in The Wizard of Oz

Sophia Lillis

as Dorothy Gale in The Wizard of Oz

Tom Holland

as John Finnegan in PTA

Lorde

as Composer in David

rockscar

as Writer, Producer & Director in David

Mark Hamill

as "The Narrator" in David

Matthew Macfadyen

as "The Older David" in David

Owen Cooper

as Young David in David

Ke Huy Quan

as Mr. Nai in David

Elizabeth Olsen

as Claire in David

Mahershala Ali

as Elijah in David

Winona Ryder

as Lilly in David

Steven Yeun

as Cameron in David

David Jonsson

as Harry in David

Samara Weaving

as Ruth in David

Hailee Steinfeld

as Julia in David

Joseph Quinn

as David in David