Thok is the best friend of Pohatu, and comes around from time to time. He is supposedly the evil nemesis of the Toa.
Mata Nui has written his own book entitled Mata Nui's Guide to the Galaxy, which has only 42 pages. He can be a bit of a jerk sometimes.
Kiina is just a person who does stuff sometimes.
Kongu is a green, whiny little weiner who always needs help in some way.