Suggestions by @adams

AnnaSophia Robb

as Barbara Gordon in Supergirl (Rebirth)

Haley Lu Richardson

as Kara Zor-El in Supergirl (Rebirth)

Armie Hammer

as Harvey Dent in Batman: Gotham Crusade

Mckenna Grace

as Young Bubbles in Powerpuff Girls

Thomas Barbusca

as Gary in Pokemon(Indigo League)

Forrest Wheeler

as Ash Ketchum in Pokemon(Indigo League)

Armie Hammer

as Harvey Dent in Gotham Knights

Finn Wolfhard

as Young Jason Todd in Gotham Knights

Matthew Daddario

as Red Hood in Gotham Knights

AnnaSophia Robb

as Batgirl in Gotham Knights

Finn Wittrock

as Young Bruce Wayne in Gotham Knights

Dylan O'Brien

as Nightwing in Gotham Knights

Zazie Beetz

as Domino in X Men

Jeremy Allen White

as Pyro in X Men

Dylan O'Brien

as Iceman in X Men

Josh Brolin

as Cable in X Men

Billie Piper

as Emma Frost in X Men

Richard Madden

as Cyclops in X Men

Yetide Badaki

as Storm in X Men

Timothée Chalamet

as Nightcrawler in X Men