Suggestions by @vincentwilliamsiii

Superboy

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

Star Sapphire (Carol Ferris)

as Carol Ferris in Lantern Corps Series S2

Bleez

as Bleez in Lantern Corps Series S2

Lucas Till (The Flash)

as Barry Allen in Lantern Corps Series S2

The Flash

as Barry Allen in Lantern Corps Series S2

Lucas Till

as Barry Allen in Lantern Corps Series S2

Atrocitus

as Atros in Lantern Corps Series S2

Black Hand

as William Hand in Lantern Corps Series S2

Thaal Sinestro

as Thaal Sinestro in Lantern Corps Series S2

Thaal Sinestro

as Thaal Sinestro in Lantern Corps Series S2