Co-Op Games for all Platforms

Basically, I want this to be a list of your favorite Co-op games for anyone who may be looking to play something with family/friends locally and/or online. If the suggestions don't overwhelm, I'll even try to move the running list up to this original post and sort them in some sort of way - probably online vs local coop.

I'll ask that if you post, you put the name of the game, platforms, maybe genre if you can manage to narrow it down, and if the coop is local, online, or both along with a description because some of us need that. Maybe a link to the [insert pc launcher here] and/or a youtube video.

Local Co-op

Online Co-op

Both

Is there an age (of the game) or platform limit? Not sure how many people care about PC Engine games from 1993 anymore.

...though Teenage Mutant Ninja Turtles IV: Turtles in Time (side scrolling beat em up) for the Super Nintendo is still amazing for couch co-op.

The Save the World part of Fortnite is co-op and cross-platform. I'm not sure if all platforms are shared, or if it's just PC/Xbox/PS4.

Full Metal Furies (PC, Switch, XB1) - 2D Brawler / puzzler, online and couch co-op (mixed at same time)
Castle Crashers (PC, PS3 & 4, Xbox 360 & One) 2D Brawler, online and couch co-op
Borderlands 1, 2, & The Pre-Sequel (PC, PS3 & 4, Xbox 360 & One) Looter Shooter FPS online

Yoshi's Woolly World (Wii U) - 2D Platformer, couch co-op
Yoshi's Crafted World (Switch) - 2D Platformer, couch co-op
Super Mario 3D World (Wii U) - 3D Platformer, couch co-op

Upcoming:
Marvel Ultimate Alliance 3 (Switch) - 3D Brawler, online and couch co-op likely

I could go on and on, but I'll stop there.

EDIT You may want to consider dividing between games built for co-op as the focus (Full Metal Furies, Castle Crashers, Borderlands), and games that allow full campaign co-op, but do not feel like it is a focus (Yoshi games), and games with only parts that include co-op (not mentioned, but something like Super Smash Bros Ultimate allows co-op in classic mode).

AUs_TBirD wrote:

Is there an age (of the game) or platform limit? Not sure how many people care about PC Engine games from 1993 anymore.

...though Teenage Mutant Ninja Turtles IV: Turtles in Time (side scrolling beat em up) for the Super Nintendo is still amazing for couch co-op.

I guess current-gen or at least available on PC would be a good enough age/platform limit. Safe to include things available via streaming too (old playstation games via PSNow and old xbox/360 games via gamepass/BC)

Both Divinity: Original Sin and its sequel have great couch coop options. Outward also has this..

Kingdom: Two Crowns has Couch Coop (Switch) and Couch + Online Coop (all other platforms I think)

Its a sort of city building game with a chill atmosphere that turns tense at night when waves of Greed enemies come at your walls.