Suggestions by @untrustworthy

Teresa Palmer

as Val Cooper in X-Men

Gabriel Basso

as Guido Carusella in X-Men

Nick Robinson

as Jamie Madrox in X-Men

Joshua Jackson

as Azazel in X-Men

Brendan Fletcher

as Rory Campbell in X-Men

Geno Segers

as The Adversary in X-Men

Siv Ngesi

as Japheth in X-Men

Amybeth McNulty

as Sarah Rushman in X-Men

Jaina Lee Ortiz

as Cecilia Reyes in X-Men

Lulu Wilson

as Rachel Summers in X-Men

Steele Stebbins

as Doug Ramsey in X-Men

Francesca Capaldi

as Amara Aquilla in X-Men

Guilherme Seta

as Roberto Da Costa in X-Men

Oakes Fegley

as Sam Guthrie in X-Men

Kiawentiio

as Danielle Moonstar in X-Men

Millie Innes

as Rahne Sinclair in X-Men

Thalia Tran

as Manh Cao Xuan in X-Men

Alexandra Daddario

as Emma Frost in X-Men

Brenda Song

as Spiral in X-Men

Timothy Olyphant

as Sebastian Shaw in X-Men