Suggestions by @oceaneyes

Dane DeHaan

as Peter Pettigrew in Marauders Fan cast

Andrew Garfield

as Remus Lupin in Marauders Fan cast

Ben Barnes

as Sirius Black in Marauders Fan cast

Aaron Taylor-Johnson

as James Potter in Marauders Fan cast

Daniel Gillies

as Victor in The Night Circus

Ian McKellen

as Friedrick Thiessen in The Night Circus

Asa Butterfield

as Ethan Barris in The Night Circus

Matt Damon

as Chandresh Lefevre in The Night Circus

Robert Downey Jr.

as Hector Bowen/Prospero in The Night Circus

Alan Rickman

as Alexander / Mr. A.H. in The Night Circus

Karen Fukuhara

as Tsukiko in The Night Circus

Florence Pugh

as Isobel Martin in The Night Circus

Nathaniel Buzolic

as Marco Alisdair in The Night Circus

Adelaine Kane

as Celia Bowen in The Night Circus

Ashley Olsen

as Lainie Burgess in The Night Circus

Mary-Kate Olsen

as Tara Burgess in The Night Circus

Cate Blanchett

as Ana Padva in The Night Circus

Joey King

as Caroline in The Night Circus

Rupert Grint

as Widget Murray in The Night Circus

Sadie Sink

as Poppet Murray in The Night Circus