Remembered an old idea of mine, Super Smash War. Basically a competitive strategy spin-off of Smash where you control various video game bosses and their minions to take each other down on various types of maps.
So, as a big example, you’d have your big boss like Bowser, who can fight directly if needed and can heavily buff his units, provide big desperation moves, etc. but their main focus is commanding said armies. If an army is just whittled down to the main boss, you probably allow them big buffs to be able to fight off whoever’s left to make up for it. You’d have second in commands and generals, in Bowser’s case, probably Kamek and the Koopalings, respectively, and you’d have all the various Mario enemies serving different purposes as lower level units, like Goombas, Koopas, Hammer Brothers, Lakitu & Spinies, Bullet Bills, Bob-Ombs, etc.
The main focus would be villains, since they have the most armies to command, but a heroic DLC pack could happen later, as characters like Peach or Marth have enough obvious to use in this respect, most likely.
Off the top of my head, the starting commanders & armies would be Bowser, Ganon/Ganondorf, Mother Brain, King Dedede, Giovanni/Mewtwo, King K. Rool, Andross, Hades or Medusa, Edelgard (arguable), Sturm, Dr. Eggman, Dr. Wily, Dracula, Dr. Zomboss, and Sarah Kerrigan. Or at least, these would be the first selection to choose from, IMO.