Depends on if you're asking about Matoran masks or Great/Noble masks. Of the latter, only the ones we saw were hidden or worn by the Toa/Turaga. But the Matoran are confirmed to have various other shapes. I guess the twelve we saw are meant to be especially popular shapes. We also directly saw three masks, which Greg later canonized as the Mask of Rebounding, Fusion, and Biomechanics worn by three Matoran celebrating Mata Nui's revival. The comic isn't clear about this, but BS01 cites them as being Matoran of Metru Nui (I'm not sure if that's actually accurate, but the background looks cityish; the text says "across the universe" though). Not sure I understand the question. Could you clarify what you're asking? Regardless of the answer to question #1, the masks they wore as Toa were the masks they wore as Turaga; had they worn different masks, they would have different masks as Toa. (Assuming the main theories as mentioned in a recent topic are correct that the Matoran shapes translate to that actual power when Great-ified.) They're optional addons included by the maskmakers. Whether they usually include them or not I'm not sure, but the Noble Akaku worn by Solek did not include one. They could also be added on, though definitely aren't standard as such, on any other mask. Nuju's Matoran and Great versions of Telekinesis had an addon (it was somehow lost in the transformation to Turaga, though). It's just style. Edit: I just realized your second question probably is about some of Vakama's group having Matoran masks in Great shape versus Noble shape. The answer is sets, of course (same reason Garan's group on Voya Nui "just happens" to all have those Great masks, etc.) But Vakama had his in Noble shape, so it's not quite true anyways. Yeah, sorry, I probably should have clarified. Yeah, I'm talking about just Matoran masks. And I'm also talking about just the Mata Nui/Metru Nui population for now. So, could there be Noble Haus, Akakus, Mirus, etc. on Metru Nui and therefore Mata Nui that are somewhat common? Same question for Great Hunas, Matatus, etc. And it would make sense for not a lot of masks (including Akakus) to be scoped on Mata Nui since the upkeep of technology outside of Onu-Koro is poor. So the Matoran who did have scoped Akakus like Matoro or Pelagia (Ga-Matoran in MNOLG II) were lucky to have scopes, right? And the Noble Mahiki's mouth design. Does that have a purpose or is it design, too? Something else that dawned on me. Defilak traded with Metru Nui at some point before being sent to Karzahni (picked up chute-speak there). Could his mask shape have been used there (Kualsi)?