Perfect Dark Let Friends Control Any Random Enemy In The Campaign
Perfect Dark for the N64 was built off an upgraded Goldeneye engine, but upped the ante by adding two boobs and way more aliens. And while the majority of the game's modes boil down to shooting AI-controlled bots (or your friends) in the face until they're dead, it had one extra magical mode that no one's ever seemed to revisit: Counter-Operative Mode.
In Counter-Operative Mode, one player controls agent Joanna Dark as she tromps through the single-player campaign, but everybody else controls low-level grunt soldiers. As a normal baddie with low health, mediocre weapons, and a questionable choice of employment, it doesn't take much to get blown away by the overpowered hero. But as soon as you're killed, you're immediately transferred to the body of another low-level goon. You're collectively controlling the bad guys, one at a time.
And on the surface, this might sound kind of lame, considering that unless you're the main character, you're playing cannon fodder. But in practice, it's a freaking blast. The game becomes much more random and difficult for the "main" player, since the enemies aren't any stronger, but as long as you're not playing with your tween cousin who huffs gorilla glue, they're much smarter. Meanwhile, the other player gets to be the grunt who thwarts the hero's grand quest. And it's not just the typical PVP multiplayer in an arena -- it's still the story of the campaign, with all of the twists and turns and setpieces.