Suggestions by @aaronnoyes

Sydney Sweeney

as Harmony Kendall in Buffy the Vampire Slayer (CW)

Emma Stone

as Tara Maclay in Buffy the Vampire Slayer (CW)

Emma Roberts

as Darla in Buffy the Vampire Slayer (CW)

Sofia Carson

as Cordelia Chase in Buffy the Vampire Slayer (CW)

Paul Rudd

as Ethan Rayne in Buffy the Vampire Slayer (CW)

John Cena

as Adam in Buffy the Vampire Slayer (CW)

Leonardo DiCaprio

as Willy the Snitch in Buffy the Vampire Slayer (CW)

Zac Efron

as Angel in Buffy the Vampire Slayer (CW)

Adam Driver

as Spike in Buffy the Vampire Slayer (CW)

David Tennant

as Rupert Giles in Buffy the Vampire Slayer (CW)

Zendaya

as The First Slayer in Buffy the Vampire Slayer (CW)

Elizabeth Olsen

as Drusilla in Buffy the Vampire Slayer (CW)

Tom Holland

as Xander Harris in Buffy the Vampire Slayer (CW)

Erin Moriarty

as Gloria in Buffy the Vampire Slayer (CW)

Zac Efron

as Riley Finn in Buffy the Vampire Slayer (CW)

Sarah Michelle Gellar

as Joyce Summers in Buffy the Vampire Slayer (CW)

Millie Bobby Brown

as Willow Rosenberg in Buffy the Vampire Slayer (CW)

Peyton List

as Buffy Summers in Buffy the Vampire Slayer (CW)

Tawnia McKiernan

as Buffy Summers in Buffy the Vampire Slayer (CW)

Ashley Johnson

as Killer Frost in DCEU Rebooted