Suggestions by @kipwalker

Bryan Cranston

as Ronald Reagan in Elizabeth

Jim Broadbent

as Winston Churchill in Elizabeth

Sonoya Mizuno

as Mulan in Mulan

Craig Robinson

as Mushu in Mulan

Tommy Lee Jones

as Grunkle Stan in Gravity Falls

Alexander Payne

as Director in Gravity Falls

Dane DeHaan

as Arthur "Boo" Radley in To Kill a Mockingbird

Andy Serkis

as Buddy in Buddy

Tim Burton

as Director in Buddy

Jessica Chastain

as Trudy Lintz in Buddy

James Corden

as Dr. Bill Lintz in Buddy

Tom Hiddleston

as Dick Croner in Buddy

Alan Cumming

as Professor Spatz in Buddy

Alexander Ludwig

as Arthur "Boo" Radley in To Kill a Mockingbird

Barry Jenkins

as Director in To Kill a Mockingbird

Ben Affleck

as Atticus Finch in To Kill a Mockingbird

Mckenna Grace

as Jean Louise "Scout" Finch in To Kill a Mockingbird

Noah Schnapp

as Jeremy Atticus "Jem" Finch in To Kill a Mockingbird

Stephan James

as Tom Robinson in To Kill a Mockingbird

Caleb Paddock

as Charles Baker "Dill" Harris in To Kill a Mockingbird