Suggestions by @sefrase

Billy Magnussen

as Lord Topaz in Shadowpact S2

Timothy Dalton

as Lord Emerald in Shadowpact S2

Genevieve O'Reilly

as Lady Turquoise in Shadowpact S2

Martin Short

as Lord Ruby in Shadowpact S2

Michael Sheen

as Lord Moonstone in Shadowpact S2

Rory McCann

as Lord Aquamarine in Shadowpact S2

Erik Valdez

as Chato Santana / El Diablo in Shadowpact S2

Aaron Taylor-Johnson

as Rick Flag in Shadowpact S2

Adam Rayner

as Acheron in Shadowpact S2

Fiona Shaw

as Citrina in Shadowpact S2

Jay Ali

as Dark Opal in Shadowpact S2

Aurora Giovinazzo

as Amaya in Shadowpact S2

Ewan Mitchell

as Edward Bloomberg in Shadowpact S2

Karen Fukuhara

as Rose Wilson in Shadowpact S2

Daniela Melchior

as Zatanna Zatara in Shadowpact S2

Andy Samberg

as Bobo T. Chimp in Shadowpact S2

Will Poulter

as Tom Tresser in Shadowpact S2

Djimon Hounsou

as Nommo Balewa / Dr Mist in Shadowpact S2

Leslie Grace

as Alba Garcia / Black Orchid in Shadowpact S2

Elizabeth Tulloch

as Eve Eden / Nightshade in Shadowpact S2