Suggestions by @j_bkr

Gary Oldman

as Commissioner James Gordon in Batman: Living Hell (2014)

James Badge Dale

as Victor Zsasz in Batman: Living Hell (2014)

Adewale Akinnuoye-Agbaje

as Killer Croc in Batman: Living Hell (2014)

Ron Perlman

as Clayface in Batman: Living Hell (2014)

Matt Damon

as Two-Face in Batman: Living Hell (2014)

Rachel McAdams

as Catwoman in Batman: Living Hell (2014)

David Tennant

as Riddler in Batman: Living Hell (2014)

Adrien Brody

as Scarecrow in Batman: Living Hell (2014)

Jessica Chastain

as Poison Ivy in Batman: Living Hell (2014)

Kristen Bell

as Harley Quinn in Batman: Living Hell (2014)

Ansel Elgort

as Robin II in Batman: Living Hell (2014)

Willem Dafoe

as Joker in Batman: Living Hell (2014)

Ben Affleck

as Batman in Batman: Living Hell (2014)

Blake Neely

as Composer in Green Arrow (2013)

Justin Marks

as Writer in Green Arrow (2013)

Paul Dini

as Producer in Green Arrow (2013)

David S. Goyer

as Director in Green Arrow (2013)

Choi Min-soo

as Yao Fei in Green Arrow (2013)

Jamie Chung

as Emiko Queen in Green Arrow (2013)

Common

as Martian Manhunter in Green Arrow (2013)