Suggestions by @jvpirate

Daisy Ridley

as Morgana Le Fay in Excalibur (2022)

Jennifer Hudson

as The Narrator in Joseph And The Amazing Technicolor Dreamcoat

Hayley Orrantia

as Eliza Doolittle in My Fair Lady (2022)

Dove Cameron

as Eliza Doolittle in My Fair Lady Remake

Kal Penn

as Knight Who Says "Ni!" in Monty Python's Spamalot

Katie Hall

as The Lady of the Lake in Spamalot

Lily Kerhoas

as The Lady of the Lake in Monty Python's Spamalot

Rory Culkin

as Demetrius in Titus Andronicus 

Taylor Lautner

as Chiron in Titus Andronicus 

Salma Hayek

as Tamora in Titus Andronicus 

James McAvoy

as Lucius in Titus Andronicus 

Gioacchino Rossini

as Composer in The Barber of Seville

Georges Bizet

as Composer in Carmen

Wolfgang Amadeus Mozart

as Composer in Don Giovanni

Terry Gilliam

as The Holder of the Holy Grail in Spamalot; The Movie; The Musical

Emmy Rossum

as The Lady of the Lake in Spamalot movie

Hayden Christensen

as Marke in Tristan and Isolde

Anna Kendrick

as Jellylorum in Cats

Zendaya

as Rumpleteazer in Cats

Lauren LaVera

as Jessica Rabbit in Who Framed Roger Rabbit