User Info: SSJGPiccles. He speaks the same gibberish Bowser does. Mixed sylabuls with some english words you can barley make out (Mostly character names like Mario or Bowser).

What language does Cappy speak in Mario Odyssey?

Then I noticed that a lot of different characters spoke all different laguages. IE: Mario: Japanese/English/Italian, Cappy: Japanese/English, Broodals: English/Japanese/Dutch? I wanted to call attention to this as it has an interesting implications on the diversity of the world of mushroom kingdom.

Is Cappy possessing Mario?

Hats off to him! One of the central mechanics of Super Mario Odyssey is possession. Thanks to his new companion, Cappy--a sentient hat whose abilities create a whole range of worrying questions--Mario is now able to take control of enemies and objects in his environment.