definitely darknuts. they were too weak and vulnerable in TP, so i wanna see them with special armor you have to cut through specifically. for example, you have to cut the back straps vertically, then there's an armor segment horizontal, have to cut off the helmet, etc. they should dish out more damage too.
as for the chuchus, they're very interesting because they come in a huge variety, each with their own characteristics. just not the chuchus from TP, i prefer the wind waker ones.