Darkseid

Darkseid is a New God of Apocalypse and father of Orion and Kaliback. He is primarily the villain for Superman but has clashed with other heroes such as Wonder Woman, Supergirl and Batman, the latter of who Darkseid respects.

Abilities
Darkseid, being a New God, has God like powers. He can fire Omega Beams from his eyes which will home in upon their target. In Justice League Unlimited, Darkseid found respect for Batman when he avoided the Omega Beams. He is also extremely durable, having withstood the full force of Superman and survived.

He is also a master planner, in The Death of Superman, he created and sent Doomsday to kill Superman so that he may invade Earth and in Justice League, he worked with Brainiac to draw out Superman to take him down.

Partners/allies
Darkseid has worked alongside many other villains and sometimes heroes.

Superman
While shocking, Darkseid has worked alongside Superman to beat back Brainiac when he came to collect Apocalypse for his collection. Going as far as to seek out Superman for his help.

Ares
In the Injustice comics, Darkseid worked alongside Ares.

Vandal Savage
In Young Justice, He respects Vandal Savage for his power and rank as the first Metahuman. The two formed a deal in which when Earth and Apocalypse are the only two worlds left, they would rage a war to see who would rule the universe.

Lex Luthor
In the final episode of Justice League Unlimited, Darkseid left with Luthor along with the Anti-Life Equation. Presumably to work together.