This isn't really so much a question about lore as it is just a curiosity I've had for some time now.
The Vahki's Biosector page mentions that you regarded them as your least favorite characters. Might I ask if you remember why that was?
I think he stated that they were his least favorite was because they were just robots without any real character.
Bingo. I never liked "horde" villains, and we had a lot of those in BIONICLE.