as a suggestion if you be a toa you cannot kill anything but monsters and animals or you get kicked out of that "group" everything attacks you including other toa,matoran,turaga and iron golems in villages
also another suggestion for the toa of water when you hit a creature with your toa tool it creates a block of water around its head untill it drowns
The first is a tad silly - what if I accidentally hit a Matoran when I'm first experimenting with Fire Armor, for example?
That's also a bit silly - if the player wants to drown something, they can use the projectile attack I suggested earlier. This would just be awkward gameplay-wise, assuming that either approach will even work as far as coding goes.