Was gonna say, NABS2's Angry Beavers is such a cool duo character design. There's definitely room to toy with the idea more, and I'd imagine the closest thing to them we could get are a Kong duo.
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One cool multi-fighter idea I've had would be Blinky from Pac-Man, who can summon the other three ghosts to trail behind him like Olimar's Pikmin (as in they're intangible while following Blinky but tangible when used for certain moves) and you can swap between the ghost you control with shield B or something.
They could have a special move that sends the next Ghost in line to chase the opponent with their Pac-Man behavior (Blinky goes straight for the opponent, Pinky screenwraps and tries to flank the opponent from the other side, Inky tries to intercept the opponent, and Clyde does whatever he feels like). Another special move could have them form a line and dash in a direction, creating a long snaking hitbox wall (that can still be attacked if you want to get rid of some ghosts).