Suggestions by @24601

Evan Rachel Wood

as Jean Grey in Characters That Need To Be In The Marvel Cinematic Universe

Score: +2

Tom Holland

as Spider man in The sinister six (2009)

Score: -2

Sean Pertwee

as Jon Arryn in A Song Of Ice And Fire

Score: +1

Luke Benward

as Jaime Lannister in A Song Of Ice And Fire

Score: +1

Bonnie Wright

as Catelyn Tully in A Song Of Ice And Fire

Score: +1

Matthew Lewis

as Robert Baratheon in A Song Of Ice And Fire

Score: +1

Robert Aramayo

as Eddard Stark in A Song Of Ice And Fire

Score: +1

Serinda Swan

as Rhaella Targaryen in A Song Of Ice And Fire

Score: +1

Luke Roberts

as Arthur Dayne in A Song Of Ice And Fire

Score: +1

Michael Sheen

as Aerys Targaryen in A Song Of Ice And Fire

Score: +1

Liev Schreiber

as Tywin Lannister in A Song Of Ice And Fire

Score: +1

Maisie Williams

as Lyanna Stark in A Song Of Ice And Fire

Score: +1

Wilf Scolding

as Rhaegar Targaryen in A Song Of Ice And Fire

Score: +1

Toni Collette

as Baba Yaga in Van Helsing: Prequel

Score: +2

Elena Anaya

as Aleera in Van Helsing: Prequel

Score: +3

Charles Dance

as Valerious the Elder in Van Helsing: Prequel

Score: +2

Kate Beckinsale

as Elisabetha in Van Helsing: Prequel

Score: +2

Richard Roxburgh

as Vladislaus in Van Helsing: Prequel

Score: +3

Hugh Jackman

as Gabriel in Van Helsing: Prequel

Score: +2

Gary Oldman

as Loki in Thor (1991)

Score: +5