Suggestions by @jdfitzgerald

Anya Taylor-Joy

as Princess Peach in The Super Mario Bros.: Animated Adventure - Season 2, 3, and 4

Emma Watson

as Princess Daisy in The Super Mario Bros.: Animated Adventure - Season 2, 3, and 4

Celia Imrie

as Little miss splendid in The Mr Men Movie

Richard Hammond

as Oliver the Great Western Engine in Thomas and the Magic Railroad (2001)

Clancy Brown

as Salty in Thomas and Friends (If it was owned by Hasbro)

Tom Holland

as Percy in Thomas and Friends (If it was owned by Hasbro)

Hugh Jackman

as Henry in Thomas and Friends (If it was owned by Hasbro)

Steve Carell

as Sir Handel in Thomas and Friends (If it was owned by Hasbro)

Alan Cumming

as Duncan in Thomas and Friends (If it was owned by Hasbro)

Simon Pegg and Nick Frost

as Iron Arry & Iron Bert in Thomas and Friends (If it was owned by Hasbro)

Malcolm McDowell

as Diesel 10 in Thomas and Friends (If it was owned by Hasbro)

Peter Cullen

as Gordon in Thomas and Friends (If it was owned by Hasbro)

Charlie Day

as Luigi Mario in Super Mario Bros.: The New Animated Series (Version 4)

Ron Perlman

as Boswer in Super Mario Bros.: The New Animated Series (Version 4)

Tom Kenny

as Diddy Kong in Super Mario Bros.: The New Animated Series (Version 4)

Bill Fagerbakke

as Donkey Kong in Super Mario Bros.: The New Animated Series (Version 4)

Simon Pegg

as Toadbert in Super Mario Bros.: The New Animated Series (Version 4)

Danny DeVito

as Mario Mario in Super Mario Bros.: The New Animated Series (Version 4)

Richard Hammond

as Oliver in Thomas the Tank Engine & Friends

Ralph Fiennes

as Ganondorf in The New Super Mario Bros. Super Show!