Suggestions by @gushrustalnbli

Rihanna

as Storm in Fox in the MCU

Denzel Washington

as Lucius Fox in Batman/Teenage Mutant Ninja Turtles

Alexander Siddig

as Ra's al Ghul in Batman/Teenage Mutant Ninja Turtles

Jackie Earle Haley

as Scarecrow in Batman/Teenage Mutant Ninja Turtles

Bryan Cranston

as Commissioner James Gordon in Batman/Teenage Mutant Ninja Turtles

Riley Keough

as Poison Ivy in Batman/Teenage Mutant Ninja Turtles

Daniel Craig

as Mr. Freeze in Batman/Teenage Mutant Ninja Turtles

KJ Apa

as Nathaniel Romanoff in DC & Marvel (Genderswap)

Eleanor Tomlinson

as Beverly Grimm in DC & Marvel (Genderswap)

Kevin Alejandro

as Hell in DC & Marvel (Genderswap)

Melissa Benoist

as Janet Storm in DC & Marvel (Genderswap)

Jennifer Connelly

as Clarice Kent in DC & Marvel (Genderswap)

Aura Garrido

as Aretha Curry in DC & Marvel (Genderswap)

Sterling Jerins

as Bailee Batson in DC & Marvel (Genderswap)

Kate Beckinsale

as Tanya Stark in DC & Marvel (Genderswap)

Karla Souza

as Bryce Wayne in DC & Marvel (Genderswap)

Amber Heard

as Stella Rogers in DC & Marvel (Genderswap)

Natalia Dyer

as Petty Parker in DC & Marvel (Genderswap)

Ashley Benson

as Brie Allen in DC & Marvel (Genderswap)

Emily DiDonato

as Holly Jordan in DC & Marvel (Genderswap)