Suggestions by @ostep925

Ian McKellen

as Ebenezer Scrooge in Scrooge

Tom Bateman

as Alfred Inglethorp in The mysterious affair at Styles

Ralph Ineson

as Inspector Japp in The mysterious affair at Styles

Angelina Jolie

as Mrs. Hubbard in Murder on the Orient Express (2010s decade)

Michael Caine

as Lawrence John Wargrave in And The There Were None (Modern AU)

Gary Oldman

as Hercule Poirot in The mysterious affair at Styles

Celia Imrie

as Emily Inglethorp in The mysterious affair at Styles

Angela Lansbury

as Princess Natalia Dragomiroff, Daisy's godmother and friend of Caroline. in Murder on the Orient Express (2007)

Octavia Spencer

as Emily Caroline Brent in And Then There Were None

Angela Lansbury

as Princess Natalia Dragomiroff in Murder on the Orient Express (2010s decade)

Julie Andrews

as Edith de Haviland in Agatha Christie's Crooked House