Suggestions by @daydreamer

Bryce Dallas Howard

as Harmony in Red Rising

Ewan McGregor

as Vladimir in Anastasia

Maggie Smith

as Empress Marie in Anastasia

Derek Klena

as Dimitri in Anastasia

Mads Mikkelsen

as Rasputin in Anastasia

Ewan McGregor

as Christopher Robin in Return to the Hundred Acre Wood

Tom Hiddleston

as Jonathan Harker in Dracula

Saoirse Ronan

as Mina Murray in Dracula

Chris Evans

as John Seward in Dracula

Domhnall Gleeson

as Arthur Holmwood in Dracula

Emilia Clarke

as Lucy Westenra in Dracula

Mark Hamill

as Abraham Van Helsing in Dracula

Clemens Schick

as Count Vlad Dracula in Dracula

Andy Serkis

as Old Man McGucket in Gravity Falls

Mark Hamill

as Old Man McGucket in Gravity Falls

Kurt Russell

as Grunkle Stan in Gravity Falls

Verity Russell

as Mabel Pines in Gravity Falls

Angourie Rice

as Wendy Corduroy in Gravity Falls

Ethan Hawke

as Legolas in The Lord of the Rings

Ethan Hawke

as Legolas in Lord of the Rings TV Series