I got to wondering what other nuva masks besides the Mata's would be like, and some of them I didn't really have any idea. But here I the ones I came up with:
Kualsi nuva: can see further for more range of teleportation, teleport through energy fields, could possibly have limited x-ray vision to teleport past walls.
Zatth nuva: has the ability to choose what you summon and send it back.
Komau nuva: can mind-control others beyond their morality(would probably be considered immoral by toa).
Calix nuva: gives super-toa/whatever physical ability.