A variety of Zelda Bosses should appear and interact with the environment, including destroying it too XD.
Also,
Bub and Bob from Bubble Bobble. They could run around the stage capturing people in bubbles leaving them open for other players to attack them, popping them in a bubble will cause more damage than regular attacks too.
I personally think Bub and Bob, Bomberman, Crash Bandicoot, Spiro, Tails and Dr Robotnik (and maybe Knuckles) should be playable characters, if not then they should at least be assist trophies (I know bomberman is already an assist trophy). Some of these characters may not have a lot of attacks in their native games but if Pacman & Mr Game & Watch can make a good playable characters, then these should be able to too.
I have (or have/had in the household): ZX Spectrum, Commodore 64, Amiga, NES, Sega Master System, Super Nintendo, Sega Megadrive, Gameboy, Playstation, Nintendo 64, Windows 95, Gameboy Colour, Windows 98, Sega Dreamcast, Gameboy Advance, PS2, Gamecube, Xbox, Windows XP, Nintendo DS, Xbox 360, Wii, PS3, Windows Vista, iPhone, Windows 7, 3DS, Wii U, PS4, Windows 10, PSVR, Switch, PS5 & PSVR2. :D
and I Don't have: Magnovox Odyssey, Any Atari's, Any Macintosh computers, Sega Gamegear, Virtual Boy, Sega Saturn, N-gage, Xbox One, Xbox Series X/S, PSP, PSVita & Andoid Phone. Plus any non-mainstream consoles/platforms I haven't mentioned.
