Assuming DC Comics realizes its mistake and returns Blackfire to her evil roots, who would you choose to serve as alien henchmen for Tamaran's Princess of Evil? Personally, I think the following characters could potentially make good underlings for Blazing B...

1) Vril Dox AKA Brainiac II: He could serve as her resident mad scientist thanks to the romantic chemistry they shared in the R.E.B.E.L.S. comics, plus despite being the anti-hero of those stories, he really did lean more towards being a baddie than a hero, kinda like Lex Luthor in space, only smart enough to cover his tracks lol.

2) Downpour & Shifter: The Ultitwins...Yes, they weren't actually aliens in Justice League Unlimited, but were pretty quick to go evil & were honestly much cooler & more formidable than their Wonder Twin counterparts, & they could easily be reintroduced as actual aliens in DC comics given their designs. Their powers would make them useful spies & assassins for Blackfire, & many may underestimate them based off their appearance rather than recognize them as serious bodyguards for Blackfire.

3) Bolphunga the Unrelenting, a humorous but formidable villain that could serve as Blackfire's muscle. I know he's usually a Green Lantern baddie, but with all the Lantern Corps villains out there a space barbarian like Bolphunga tends to get overlooked by the likes of Sinestro, Atrocitus, & Larfleeze, etc

4) Cironielian Chrysalis Eater: In her humanoid form she could serve as a seneschal or handmaiden to Blackfire, but then change into her monstrous combat form to dispatch her queen's enemies >;3