Definitely Omen and Shadow Jago. Though Omen’s story kind of suggested he might try to break away from Gargos and do his own thing.
Possibly Kan-Ra out of pure fear lol I can see Gargos coming from the portal and Kan-ra being absolutely terrified and bow down and offer to be a minion of his.
His Herald: Omen
His failed vessel: Shago
His combat minions: Izzik and Dretch
“Human” agents: The Tzar(Vampire Coven, including Mira), The eyes of Rylai(Sadira, convinced by Omen)
New character as his Field General: Eyedol?
His army: The mimics, an army of morphing creatures who takes the form of Earth fighters