User blog comment:BobTheDoctor27/February 2013 Update/@comment-5918010-20130312003428/@comment-958607-20130312164438

Hmm, I generally go by the assumption that the mouth is not part of the Kanohi, rather that the mouth can be connected up to the Kanohi once it is magnetized to a character's face. I believe that the ridges and holes in a Kanohi's shape show the face through them and things like eyelids are not connected. Furthermore, I believe that BIONICLE characters are more organic than mechanic. I perhaps give them more blood than they would have but I believe that they do have pockets of organic matter. When I rewrite Frozen Calling I'll probably replace the blood with hydraulic fluid or something more mechanical.

I'm pleasantly surprised by how accurate Echo 1's response is. :D I'd forgotten about half of that stuff.