Suggestions by @nathanholmes

David Dastmalchian

as Polka-Dot Man in Batman

Charles Dance

as Calculator in Batman

James McAvoy

as Victor Zsasz in Batman

Daniela Melchior

as Ratcatcher 2 in Batman

Dane DeHaan

as Anarky in Batman

Ruby Rose

as Copperhead 2 in Batman

Alfred Molina

as Calendar Man in Batman

Jamie Foxx

as Black Spider in Batman

Sebastian Stan

as Owlman in Batman

Michael Jai White

as Bronze Tiger in Batman

Zhang Meng'er

as Lady Shiva in Batman

Simon Pegg

as Mad Hatter in Batman

Daniel Radcliffe

as Firefly in Batman

Fred Tatasciore

as Solomon Grundy in Batman

Peyton List

as Golden Glider in Arrowverse

Devon Graye

as Trickster 2 in Arrowverse

Anthony Carrigan

as Mist in Arrowverse

Paul Anthony

as Rainbow Raider in Arrowverse

Melise

as Doctor Light in Arrowverse

Doug Jones

as Deathbolt in Arrowverse