Suggestions by @dc_black_label

Scott Adkins

as Batman in Joker: Killer Smile

Score: +1

Marwan Kenzari

as Dr. Ben Arnell in Joker: Killer Smile

Score: +1

Damon Herriman

as The Joker in Joker: Killer Smile

Score: +1

Peter Stormare

as Professor Pyg (dream) in Joker: Killer Smile

Score: +1

Cory Michael Smith

as The Riddler (dream) in Joker: Killer Smile

Score: +1

Florian Munteanu

as Bane (dream) in Joker: Killer Smile

Score: +1

Paul Giamatti

as The Penguin (dream) in Joker: Killer Smile

Score: +1

Ian Chen

as Simon Arnell in Joker: Killer Smile

Score: +1

Michael Cudlitz

as Joe in Joker: Killer Smile

Score: +1

Betty Gabriel

as Dr. Marie Hutchins in Joker: Killer Smile

Score: +1

Martin Scorsese

as Director in Joker: Killer Smile

Score: +1

Anthony Carrigan

as Victor Zsasz in Batman: Last Knight on Earth

Score: +1

Logan Marshall-Green

as Clayface in Batman: Last Knight on Earth

Score: +1

Karen Fukuhara

as Anna Arnell in Joker: Killer Smile

Score: +1

Jeff Lemire

as Writer in Joker: Killer Smile

Score: +1

Jeff Lemire

as Producer in Joker: Killer Smile

Score: +1

Kristina Pimenova

as Harleen Quinzel (teenager) in Harleen

Score: +1

John Stamos

as Professor Collins (flashback) in Harleen

Score: +1

Jack Nicholson

as The Bat Beast in Harleen

Score: +1

Patrick Warburton

as Sam in Harleen

Score: +1