I don't know a whole lot with generation 3 other than its not a real thing, the matoran are cast into a deep slumber - and lewa's a girl now...
anyway, thought i'd come up with something, the idea was if the matoran are a sleep and not able to fend for them selvs until the toa arrive, who will protect them? the Turaga of course! the idea came from mixing the G2 idea of warrior like elders with the respected G1 characters.
iv'e only done vakama so far. the idea is that over time he's adapted to the change on the island of - whatever - so, he's got a spear that has the same power as one of those fire visohrak where their spinners create a burning sensation when it strikes a target, I also tried to give him a disk launcher, but i don't like that idea much.
messy concept sketch of vakama: