Most of these have been mentioned before, but I’ll mention them again.
Halo Master Chief Collection. Everything before 5 is local split screen. 5 requires two Xboxs. I would just avoid Infinite, but I believe it also requires two systems, maybe including PC.
Diablo 3 is very accessible. 4 should be as well. I’m told Diablo 2 is the best, so I need to try to get back into it. All should be good options.
Monster Hunter requires more patience. At least for World, cooperation is good but really the game is geared towards individuals being able to take charge as necessary. Track, set traps, bait, capture, etc. Multiplayer is VERY useful during fights though.
Stranger of Paradise is kinda Souls-like but more forgiving. In my experience it’s A LOT more friendly to Multiplayer. It’s also a ton of fun with a friend.
Psi-Ops: Mindgate Conspiracy. An old PS2 game. One person controls the body, the other controls the mind. Especially if you have a Gameshark and you can go Godmode.
Ay of the old Street sports games were a blast back in the day.
Older Twisted Metal for another old-school recommendations.