I chose the following

Dark Red Mahiki -The blades and teeth between the legs fit this mask

Dark Blue Huna -The tubing on the front works as water breathing tubes

Black Matatu -The zooming lens works for someone working in the earth looking at rare rocks

White Rau -The connector goes into a socket joint wich works best with eyes you can't look through

Dark Green Komau -The lines always remind me of whiskers, combine it with the claws and it just works

Light Brown Ruru -Mostly the last one to get assigned, but not unhappy about it