What consoles can/can't be emulated on the Pi 5?

I recently started a class at my local tech school and we are soon going to be given Raspberry Pi 5s to use through the course and eventually develop them into whatever we want. I plan on trying to make a custom hand held retro emulator with it, but i want to know what retro games can or cannot be emulated by the Pi 5 before i go too into the idea. I would love to run snes/gameboy games and gamecube/xbox games, but i want to get a realistic scope of what is possible.