The Best Local Coop

Streets of Rage Remake V5 is a freeware game and damn awesome.

Jamestown. Not at all like the games youre suggesting, and I wasn't interested in it at all until I played it, but believe me, it's awesome. Plus the game is built for local co-op- there isnt even on online co-op

Lego games.

magicka, so many "accidental" pvp kills :)

Castle Crashers is pretty good local co-op :)

Ninja Baseball Batman

Castle Crashers

Shank, not Shank 2. Shank 2 is for stinkers.
Trine 2 is also really fun, but it's not for everybody.
Also note if you want local co-op for Castle Crashers you need 2 gamepads.

Rayman Origins definitely, Trine and Awesomenauts (Only 3 player), Castle Crashers, Worms, Civilization and Flatout (hotseat), Magicka, Serious Sam, Shadowgrounds, Dungeon Defenders, the lego games and Shank (2 player), Some Fighting games for tournaments (Mortal Kombat, Street Fighter)

Is not on steam, but I need to tell, cobalt, from mojang, its the best coop game ive ever seen! playcobalt.com

Monaco. Monaco, monaco, monaco.

Monaco.

Monaco.

Trine 1/2, Iron Brigade, Jamestown... for Vs hotseat, any worms game.

super smash bros emu, gogo

Splinter Cell: Conviction has a pretty fun coop.

Renegade ops,Trine 2(3 players),portal 2(2players),Worms games,dungeon defenders(4players),bloody trapland(fun as hell,4players),mari0 might be interesting aswell(and it;s free)

Castle Crashers, Blur, Jamestown, Dead Pixel, Trine 1/2, Left 4 Dead 1/2, Shank 1/2, Dungeon Defenders, and Magicka.

Castle Crashers.

Worms. the original.

I say it every time this is brought up: Cortex Command!

Lego Games (i recommend Lego Harry Potter), also Rayman Origins (up to 4 players)

TrackMania Nations Forever (Free version) or Canyon and Worms Reloaded.