Suggestions by @mr95

Terry O'Quinn

as Obadiah Stane / Iron Monger in Iron Man

Corey Feldman

as Happy Hogan in Iron Man

Deborah Ann Woll

as Pepper Potts in Iron Man

Joseph Gordon-Levitt

as Iron Man / Tony Stark in Iron Man

Tom Glynn-Carney

as Legion in New Mutants

Meg Donnelly

as Boom Boom in New Mutants

Vivian Oparah

as Stevie Hunter in New Mutants

Owen Teague

as Warlock in New Mutants

Mason Thames

as Cypher in New Mutants

Dixie Egerickx

as Wolfsbane in New Mutants

Isabel May

as Magik in New Mutants

Charlie Plummer

as Cannonball in New Mutants

Rafaela Cocal

as Magma in New Mutants

Thalia Tran

as Karma in New Mutants

Christian Malheiros

as Sunspot in New Mutants

Kiawentiio

as Mirage in New Mutants

Quintessa Swindell

as Kid Quick (Jess Chambers) in Flash

Linnea Berthelsen

as Fast Track (Meena Dhawan) in Flash

Saniyya Sidney

as XS (Jenni Ognats) in Flash

Maria Zhang

as Flash (Avery Ho) in Flash