Suggestions by @mephilesthedark

Albert Brooks

as Dr. Octopus in New Voice Actors to Play Marvel and DC Characters

Anna Brisbin

as Harley Quinn in New Voice Actors to Play Marvel and DC Characters

James Marsters

as Sinestro in New Voice Actors to Play Marvel and DC Characters

Elizabeth Maxwell

as Surge the Tenrec in Sonic: Return of Mephiles

Cory DeVante Williams

as Electro in New Voice Actors to Play Marvel and DC Characters

Michael Kovach

as Electro in New Voice Actors to Play Marvel and DC Characters

CaseOh

as Condiment King in New Voice Actors to Play Marvel and DC Characters

Anna Brisbin

as Squirrel Girl in New Voice Actors to Play Marvel and DC Characters

Alex Rochon

as Mysterio in New Voice Actors to Play Marvel and DC Characters

Mark Fischbach

as Mysterio in New Voice Actors to Play Marvel and DC Characters

Matthew Patrick

as The Riddler in New Voice Actors to Play Marvel and DC Characters

Matthew Lillard

as Reverse Flash in New Voice Actors to Play Marvel and DC Characters

Jeremy Irons

as Brainiac in New Voice Actors to Play Marvel and DC Characters

Mark Fischbach

as Beast in New Voice Actors to Play Marvel and DC Characters

Alejandro Saab

as Gambit in New Voice Actors to Play Marvel and DC Characters

Matthew Patrick

as The Riddler in Batman Villains (James Gunn's DCU)

General Kai

as Cary-Hiroyuki Tagawa in Deceased Actors’ Casting You Would’ve Loved to See

Lord Shen

as Cary-Hiroyuki Tagawa in Deceased Actors’ Casting You Would’ve Loved to See

Tai Lung

as Cary-Hiroyuki Tagawa in Deceased Actors’ Casting You Would’ve Loved to See

Satan (Helluva Boss)

as Kevin Conroy in Deceased Actors’ Casting You Would’ve Loved to See