Shouldercanon time re: character colours because I have so many thoughts on tweaking existing colours that I need to write down
We know on Metru Nui that powerless Kanohi were marked with silver to denote this. While some have theorized that this is due to rank - Matoran wear silver, Turaga wear black (Dume) and Toa get full colours; I and others posit that it may be for emergency situations! If a Toa needs a mask quickly, they could scan a crowd to tell the power level of Kanohi and borrow a nearby resident/worker's mask. This would also give us some nice variety between characters!
However, every depiction of Metru Nui matoran shows them wearing silvered masks. I shouldercanon this as being the result of Makuta!Dume, cutting off resources to the Toa and suggesting Matoran should not waste powered Kanohi like this.
Taking it a step further, black representing noble Kanohi feels weird when masks can already be black on a Matoran. While we know Toa can have pearl/metallic colours on them, I also theorize that this is mostly honorific armour rather than a base state, in most cases. Therefore, I suggest Pearl Dark Gray (gunmetal) to denote Noble Kanohi, and the blend of black was a hint that it was Teridax in disguise.













