Thanks for the suggestions!+Pedro Henrique
I like the idea of Scribblenauts as a co-op game of sorts.+Scott Valentine
I've seen Mario Party and the Bowser mode. Seems interesting. With Mario Kart, the kart often goes the wrong way, ha. Child of Light is a good suggestion. I am just have ignored it because the Wii U hasn't received all the DLC as others.
I've been looking into retro eShop games, since they're simpler. Kids don't easily grasp 3D controls, especially when there's shoulder buttons and analog sticks. Excitebike is good - push the gas and directions.
Games nowadays are built on top of decades of experience, and aren't simple as before.