Suggestions by @quorange

Charlie Rowe

as Martin Scorsese in Director BioPics

Jason Schwartzman

as Martin Scorsese in Director BioPics

Anthony Ingruber

as Harrison Ford in Actor BioPics

Jamie Costa

as Robin Williams in Actor BioPics

Bill Hader

as Steve Martin in Actor BioPics

John Mulaney

as Martin Short in Actor BioPics

Lucas Hedges

as Shia LaBeouf in Actor BioPics

Aaron Taylor-Johnson

as Christian Bale in Actor BioPics

Tom Holland

as Christian Bale in Actor BioPics

Jamie Bell

as Ewan McGregor in Actor BioPics

Miles Teller

as Robert De Niro in Actor BioPics

Oscar Isaac

as Al Pacino in Actor BioPics

Tom Hardy

as Marlon Brando in Actor BioPics

Scarlett Johansson

as Marilyn Monroe in Actor BioPics

Joseph Gordon-Levitt

as Heath Ledger in Actor BioPics

Joaquin Phoenix

as Daniel Day-Lewis in Actor BioPics

Mike Moh

as Bruce Lee in Actor BioPics

Jake Choi

as Brandon Lee in Actor BioPics

Jack McMullen

as Robert Downey Jr in Actor BioPics

Nicholas Hamilton

as River Phoenix in Actor BioPics