MU Theme Search: Matchups that could have a similar vibe to Ultron vs Sigma (semi army fights)

As in they have army’s and they’re there but they aren’t the determining factor like Bowser vs Eggman since the BOSSES will do the heavy lifting while the armies just fight in the background

Like for Kylo Ren vs Edelgard I just imagine Stormtroopers fighting Knights like in a war! While the main ones focus on each other (while maybe adding in the black eagle students minus byleth and the Knights of Ren or Phasma)