Suggestions by @vincentwilliamsiii

Black Canary (Dinah Lance)

as Dinah Laurel Drake in Task Force X I

John Lynch (DC)

as John Lynch in Task Force X I

Grifter

as Cole Cash in Task Force X I

Amanda Waller

as Amanda Waller in Task Force X I

Deathstroke (Slade Wilson)

as Slade Wilson in Task Force X I

Steve Trevor

as Steve Trevor in Task Force X I

Steve Trevor

as Steve Trevor in Wonder Woman II

Reign (Supergirl)

as Reign in Supergirl I

General Dru-Zod

as Dru-Zod in Supergirl I

Superboy (Connor Kent)

as Subject 13 in Supergirl I

Silver Banshee (Siobhan Smythe)

as Siobhan Smythe in Supergirl I

Alura In-Ze

as Alura In-Ze in Supergirl I

Zor-El

as Zor-El in Supergirl I

Supergirl (Kara Zor-El)

as Kara Zor-El/Kara Danvers in Supergirl I

Superman

as Kal-El/Clark Kent in Supergirl I

Ganthet

as Ganthet in Lantern Corps Series S2

Mongul

as Mongul in Lantern Corps Series S2

Kilowog

as Kilowog in Lantern Corps Series S2

Green Lantern (Kyle Rayner)

as Kyle Rayner in Lantern Corps Series S2

Dex-Starr

as Dexter in Lantern Corps Series S2