A wise, aged soul, Donkey Kong was one of the first souls to be trapped within the kingdom, and as a benefit of this, is one of only a few to have gotten his life together. Staying on the outskirts, he lives in his hut alongside his parental figure, Cranky Kong, and is rarely visited by others due to the dangerous waters surrounding it. A friend to those who respect his privacy, he's a terrifying foe when disrespected.

A deeper, more aged voice could work, but honestly, I could see a lot of things working with him, so experiment a bit if you want.