Superman

Brainiac

Silver/Bronze Age DC, Superman villain

Adam Strange

champion of Rann

Gorilla Grodd

Flash villain

Impulse

Bart Allen

Black Manta

David Hyde, Aquaman villain

Salakk

Archetrope

Superboy

Jon Kent, Lois's son

Steve Lombard

Vril Dox

Modern Age DC, Brainiac

Sardath

of Rann, father-in-law of Adam Strange

Amethyst

Amy Winston / Princess Amaya, Young Justice, DC

Mark Shaw

Manhunter; Privateer; etc.

Teen Lantern

Garryn Bek

DC

Myand'r

Tamaranean, father of Starfire

Jinny Hex

descendant of Jonah Hex

Lyrissa Mallor

of Talok VIII