As far as you can tell, Kuviu doesn't have any "powers" aside from flight and being a crack shot with a rifle, but he hardly needs them. You use your infusion ability to give him support, and you don't pick up a chainsaw, and that's how you like it. Someone competent at fighting between you and the legions of monsters standing in the way of your quest. You feel a little bit like a councilmyd with a bodyguard for what are sometimes euphemistically referred to as "tense negotiations."