Two or more Main Villains who work together and share the role of main villain is what to describe this. Despite their partnership often one of the villains will betray the others so they can be the only main villain there.
Examples
Slade and Anti Cosmo (Kinda as Slade is more in charge) in The Beginning, A More straight example with Slade and Bender in Slade Strikes Back as both of them were working together and not under another.
Hunson Abadeer, The Joker and Darkwarrior Duck in The Great Time Travel Adventure
Discord and Terrance Lewis for Totally Mobian Spies and with Dr.Weil for THe Multiuniversal War of Destiny
Possibly Hunson Abadeer once again with Dornammu in Tuxedo Lovelace vs CarnEvil
Mechuckles and Elder God in Rise of Mechuckles:Beware of the Sith Stalker
Steven Armstrong and Darth Sion in The Final Stand
Duskmon alone for first half with Rydak and Nekron with King Henry and King George for second half in LOTM: Journey Through the Mists.
Hazama, Relius Clover and Sumdac in Legends Of Light and Darkness as the real antagonists.
Dormammu and Phantom Blot and Pandora, Hal 9000, and Morpheus D. Duvall in Christmas Bizarro in July
Gus Fring and Kingpin, Darkonda and Evil James Woods, Johan Liebert and Aldrich Killian and King Shadow, Sylar and Lucifer and Zorg and Zavok with The Deadly Six, Zeus, Beelzeboss and Treize Khushrenda in Meister of War.
Ra`s Al Ghul (Batman Begins) and Wicked Witch of The West (Once Upon A Time) in The Legend of Maka Albarn as the reprsentators of The Umbrankentic League, Shinnok and Shaula Gorgon and Alduin and Lord Tirek
Rodrigo Borgia and Al Mualim in Blackpool
Garret Bobby Furgerson and Jesse for LOTM: Next Gen Island TOur the first half, with Loki, Albert Wesker and The Smoking Man for the second half of the story
Eirik, Khorne, and The Tall Man for the Viking Alliance in Future Warfare
Palpatine and Darth Vader, Xehanort and Jasper, The Huntsman and Immortan Joe, and Ukano, Dimitri Rascalov and Ludd Whitehill for LOTM: The New Multi-Universal War
Ultron and Sigma (Megaman X) for LOTM: The Untold Story of Robots and Machines
Eobard Thawne, Deathstroke, Toffee and The Joker of The Multiversing Adventure. Thawne is the one in charge of the team, but all 4 of the villains are main characters and each are working to their own interests. Then Toffee emerges as the sole Main Villain and in his own partnership with Bill Cipher.
Toffee and Bill Cipher for Return of the Weirdmagedon Cult
Cleopatra Setori and Nolan Greyson for Team Free Will: Diassessmbled
Emperor Belos and Vecna in Chang's Guide to The Galaxy
The Doctor N .Trophies of Streamverse with The Spot as a secondary main villain.
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Sephiria KnightWalker -
Ragnarok Iblis -
Vira Hermes -
The Smoking Man -
Sir Isaac Ray Peram Westcott -
Pandora (Saint Seiya) -
Sari Sumdac -
Discord
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