Suggestions by @jojoinabox

Matt Smith

as Rincewind in Discworld

Jeremy Irons

as Lord Havelock Vetinari in Discworld

Anna Kendrick

as Princess Cimorene in Enchanted Forest Chronicles

John Finnemore

as Fiddlesticks in Enchanted Forest Chronicles

Chris Pine

as King Mendanbar in Enchanted Forest Chronicles

Roger Allam

as Jasper Darlington Higgins IV in Enchanted Forest Chronicles

Emma Thompson

as Kazul in Enchanted Forest Chronicles

Louise Brealey

as Magrat Garlick in Discworld

Richard Madden

as Malcom in Macbeth

Lulu

as Third Witch in Macbeth

Rose Leslie

as Second Witch in Macbeth

Michelle Gomez

as First Witch in Macbeth

David Tennant

as Banquo in Macbeth

Karen Gillan

as Lady Macbeth in Macbeth

Sean Connery

as Duncan in Macbeth

James McAvoy

as Macbeth in Macbeth

Iain Glen

as Macduff in Macbeth

Peter Capaldi

as The Porter in Macbeth

Elizabeth Olsen

as Bianca in Othello

Jim Broadbent

as Brabrantio in Othello