Suggestions by @jancelotdulac

Josh Brolin

as Gurney Halleck in Children of Dune

Score: +1

Javier Bardem

as Stilgar in Children of Dune

Score: +1

Stellan Skarsgård

as Baron Harkonnen in Children of Dune

Score: +1

Rebecca Ferguson

as Lady Jessica in Children of Dune

Score: +1

Florence Pugh

as Princess Irulan in Children of Dune

Score: +1

Jason Momoa

as Duncan Idaho in Children of Dune

Score: +2

Timothée Chalamet

as The Preacher in Children of Dune

Score: +2

Anya Taylor-Joy

as Alia in Children of Dune

Score: +1

Tom Glynn-Carney

as Farad'n Corrino in Children of Dune

Score: +1

Nico Parker

as Ghanima in Children of Dune

Score: +3

Harry Gilby

as Leto II in Children of Dune

Score: 0

Harry Collett

as Leto II in Children of Dune

Score: +1

Oliver Huntingdon

as Denny Doherty in California Dreamin'

Score: +2

Nicola Coughlan

as Cass Elliot in California Dreamin'

Score: +1

Maya Hawke

as Mia Farrow in California Dreamin'

Score: +1

Aaron Taylor-Johnson

as John Phillips in California Dreamin'

Score: +1

Jude Law

as Frank Sinatra in California Dreamin'

Score: +1

Lucy Boynton

as Sharon Tate in California Dreamin'

Score: +1

Milly Alcock

as Michelle Phillips in California Dreamin'

Score: +2

Keanu Reeves

as Paul Atreides in Children of Dune (Mini-Series)

Score: +2