Suggestions by @adams

Julian Hilliard

as George Little in Stuart Little (Live-Action)

Julian Hilliard

as Corduroy in Corduroy

Margot Robbie

as Barbra in Night of the Living Dead

Noah Jupe

as Harry Potter in Harry Potter (Recasted)

Elle Fanning

as Supergirl in Super

Chloë Grace Moretz

as Supergirl in Super

David Giuntoli

as Superman in Super

Asa Butterfield

as Tim Drake in Batman

Dylan O'Brien

as Dick Grayson in Batman

Matthew Daddario

as Jason Todd in Batman

John Boyega

as Firestorm in Legends of Tomorrow

Kylie Bunbury

as White Canary in Legends of Tomorrow

Joe Keery

as Norville Rogers in Mystery Incorporated

Dylan O'Brien

as Lone Ranger in Lone Ranger Reboot

Geraldine Viswanathan

as Kamala Khan in Justice League vs The Avengers

Charlie Hunnam

as Oliver Queen in Justice League vs The Avengers

Ian Anthony Dale

as Namor McKenzie in Justice League vs The Avengers

David Giuntoli

as Clark Kent in Justice League vs The Avengers

Kiersey Clemons

as Shuri in MCU Characters (But with the DCEU Cast)

Ezra Miller

as Pietro Maximoff in MCU Characters (But with the DCEU Cast)