Why do think Nuparu has an orange mask?It doesn't make sence.

Moving to Theories...

SO? takua has a blue mask that doesen't make sence does it?

Ya that dosen't make sense because he has grey feet so he should have a grey mask but lego thought that orange would look cooler probally.

Well I think that Takua and Napuru have strange colored masks because they need to be easily distinguishable from other Matoran.

i like it but whit a grey mask(like his foot)can be most cool!

Since the Boxor itself is mainly made with black, dark grey, and orange pieces, it makes sense for its driver to match those colours.  

If the entire Boxor set was just black and dark grey, I don't think it would be as interesting.

I agree with the theory that engineers in Onu-Koro are coloured coded with orange masks. The Matoran in the Ussalry have purple masks. Personally i like his orange mask, nothing wrong about it.