Suggestions by @charlesp

Jean Reno

as August Dupin in The League of the Extraodinary Gentlemen

Rachel Weisz

as Mary Poppins in The League of the Extraodinary Gentlemen

Ted Levine

as Hugo "Bulldog" Drummond in The League of the Extraodinary Gentlemen

Michael Shannon

as Oliver Haddo in The League of the Extraodinary Gentlemen

Freida Pinto

as Janni Dakkar in The League of the Extraodinary Gentlemen

Robbie Coltrane

as Mycroft Holmes in The League of the Extraodinary Gentlemen

John C. Reilly

as Champion Bond in The League of the Extraodinary Gentlemen

Charles Dance

as Professor James Moriarty in The League of the Extraodinary Gentlemen

Ken Watanabe

as Fu Manchu in The League of the Extraodinary Gentlemen

Burn Gorman

as Hawley Griffin in The League of the Extraodinary Gentlemen

Benedict Cumberbatch

as Dr. Henry Jekyll in The League of the Extraodinary Gentlemen

Irrfan Khan

as Captain Nemo in The League of the Extraodinary Gentlemen

Gemma Arterton

as Mina Murray in The League of the Extraodinary Gentlemen

Clint Eastwood

as Allan Quatermain in The League of the Extraodinary Gentlemen

Mark Addy

as Ispector G. Lestrade in The Adventures of Sherlock Holmes

Joaquin Phoenix

as The Joker in Legion Of Doom

Viggo Mortensen

as Ra's Al Ghul in Legion Of Doom

Shazad Latif

as Aladdin in Aladdin

Elizabeth Gillies

as Zatanna in Young Justice

Caitlin Carmichael

as Trixie Tang in Fairy OddParents