I start to think that a matoran rpg would be a lot easier to get started o, then a toa rpg, since you have to start as a weak civilian and work yourself upwards, while toa already have all the abilities, magic weapons and stuff.
With a matoran you get to choose your village, which gets you a small bonus and a maybe a starting mask or not even that, since the wiki says, that many matorans wear powerless masks, who don't have any other effects other to keep them alive. That#s right, if they walk around without any mask for too long they die.
Let's say we use a d10 ruleset like mentioned here
then we could make different weapon skills based on the weapons used by the matoran characters.
Those are for example: Spears, Discs and Disc launchers, Kohli Sticks, Axes, Staffs, Swords, Tridents, etc.
Better we use some categories like long range, close range, heavy weapons, ranged combat, etc. or it becomes too much.
Next are the other skills, which could be devided into different categories like:
And then we have to inntegrate the various mask powers. And sicne it says that there are different kidns of masks (Talking about power level) Players should only be able to use powerfull masks, when they have a high enough level.