Maggie Sawyer and Vixen
Human Flame and Funky Flashman
Maggie Sawyer was the police contact for Superman, who was in Brad Meltzer’s Justice League of America with Vixen.
Human Flame was an enemy of Martian Manhunter, who was in the JLI with Mister Miracle, whose publicist was Funky Flashman.
Vandal Savage and Mogo.
Vandal Savage’s Golden Age nemesis was Alan Scott, who’s an honorary member of the Green Lantern Corps, which includes Mogo.
(Or: Vandal Savage’s Pre-Zero Hour nemesis was Wally West, who was in Grant Morrison’s JLA with Kyle Rayner, who’s in the Green Lantern Corps with Mogo.)
trickster
Scarback
Hates their suit theme
Blight
Citizen Steel
Trickster was in the Rogues with Captain Cold, who heisted Jay Garrick’s helmet from the Flash Museum with Catwoman, who was summoned via a grotesque “catsignal” by Tommy Monaghan, who shot Scarback.
Blight is the nemesis of Terry McGinnis, whose biological father is Batman, who was in the Justice League with Martian Manhunter, who was in Justice League Detroit with Citizen Steel.
scarback
lex luthor
Scarback was shot by Tommy Monaghan, who shared a rooftop meditation on the nature of America with Superman, whose nemesis is Lex Luthor.
How about Ishido Maad and Mazikeen?
Ishido Maad kidnapped Secret, who was mentored by The Spectre, who fought in the first rebellion against Lucifer, whose most loyal servant is Mazikeen.
That’s awesome!!
Do both have to be DC owned characters?
Well, try me.
This should be easy for you but okay.
Leo Splinterson and Richard Dragon
Leonardo defeated Ra’s al Ghul and Shredder in a team-up with Batman (Batman/TMNT), who was trained by Richard Dragon.
Female martial artist theme
Lady Shiva and Judomaster
Lady Shiva once chose Black Canary as her successor, who after leaving the Birds of Prey was substituted by Judomaster.