You are technically correct, those are unknown as well. I didn’t list them for two reasons:
Every Onu-Matoran from Metru Nui/Mata Nui has a black torso except Taipu, Dosne, and Mamru. Taipu is still predominantly black, with both his feet and mask being black, and Mamru was the same prior to the rebuilding. This suggests to me that Black is the primary color for Onu-Matoran; those Onu-Matoran who don’t have black torsos have black feet and masks, so as to be predominantly black; and Mamru and Dosne replaced/recolored their masks during the rebuilding for unknown reasons, thus causing them to be exceptions.
Every Matoran on Metru Nui had grey arms and legs.
The arm/leg colors of post-cataclysm forms are reflected in metrutoran hand/feet colors. They are not unanimously grey, only the pieces in between are grey.
In any case, the only coloration we have confirmed for Mavrah is a purple Pakari. The rest is up to imagination.
@TheJerminator@Willess12 Do you know if Mavrah is confirmed to wear an unmodified great version? I always imagined him as an Onepu clone but a noble version or a scope like Nuju and BC’s version could make him more interesting.
The qoute of origin does not imply anything specific:
Q: What mask does Mavrah wear? And what colours are he? A: Purple Pakari, and I don’t have his body colors.
Uh, yeah, that’s what I was referring to. The leg/arm pieces and the sockets for the joints/hands are grey on every Metrutoran. Only the feet, torso, and mask are colored.
Why?
The only thing unknown about him is his colors (and maybe the mask, if a noble Pakari is allowed). A moc contest would be pointless.
Greg: I’m going to be absolutely specific about the mask and the color of it
Also Greg: yeah I dunno what the rest of him looks like
The shape of the mask has never been explicitly stated, from what I can find. However, there is one quote which suggests that Onepu and Marvah’s masks are identical:
Note that the question starts with the assumption that the masks are identical, and Greg seems to confirm it.
That would depend on if this (hypothetical) contest would be depicting him as he is now, on the Red Star, or as he appeared in the tunnels in the Great Barrier.
If it’s the former, he almost certainly doesn’t have any paint left; aside from the river, he’s also been there for over a thousand years, presumably on the run from the Kestora.
This would unironically be the best contest. “Who can build the best dead Onu-Matoran?” And of course TTV would mandate that entries be posed face-down in water. This must take priority over Tuyet.
Also, Turaga Takanuva from The Kingdom. I suppose all parallel dimensions have variants of each character, not necessarily looking exactly the same but having identical powers and else.
