Suggestions by @dickcooper

Curran Walters

as Bolin in Legend of Korra

Booboo Stewart

as Mako in Legend of Korra

Zendaya

as Korra in Legend of Korra

Kiersey Clemons

as Halo in Nightwing

Grant Gustin

as Geo Force in Nightwing

Jamie Chung

as Katana in Nightwing

Richard Zeppieri

as Tony Zucco in Nightwing

Emma Mackey

as Emma Kitty in Starfire

Jonathan Majors

as Monitor in Starfire

Jacob Tremblay

as Kid Flash in Starfire

Mckenna Grace

as Xs in Starfire

Miles Teller

as Superman in The Outsiders

Damaris Lewis

as Blackfire in The Outsiders

Joshua Orpin

as Superboy in The Outsiders

Taylor Swift

as Killer Frost in The Outsiders

KJ Apa

as Flash III in The Outsiders

Katie Holmes

as Talia Al Ghul in The Outsiders

Billy Burke

as Peter Welling in The Outsiders

Emma Mackey

as Emma Kitty in The Outsiders

Jay Lycurgo

as Robin III in The Outsiders