i think the makuta will be based of members of the brotherhood.
nidiki (green) = vile, hot-tempered, and a first foe they must face. an insect like makuta who corrupted the part of the jungle ruins with his granted makuta mask of poisoning that mutates foes and corrupt the jungle into a polluted place. aiding the corrupt nui-rama into finding the green golden shard of the ??? mask.
krekaa (navy) = strong, powerful, but a completely stupid makuta. he causes much chaos around the crystal ruins with his tank like form and his dark mask of chaos. he was unable to find a missing blue golden shard for a mask, and even causing earthquakes where ever he go, unable to have sense of turn around.
roodaka (violet) = a cunning, evil, female makuta who is also a queen of spiders. creating web of lies using a dark mask of fear, she makes every matoran kneel before her and fear her power. she leads an army of spiders under her influence she wares a violet shard as a crown rather then retrieving it.
sidorak (dark orange) = he is arrogant, greedy, and care only nothing else but himself. a makuta who is so-called king the pirates and anyone who appose him will be striped from any elemental properties using a dark mask of greed, leads an army of pirates, he took the golden shard and keeps it in the only storage that ever was: his golden throne.
umbrak (gray) = who ever finds him will be forgetting he was ever there before using an infamous dark mask of obliviously. he is a well trained stealthy assassin who lead shadow ninjas that will trap or trick any toa that approaches. his keep is a golden shard of ultimate power that he use as a hilt, turning it into a powerful katana. he is a smartest makuta of all. (who was once a toa)
teridax (black) = you know the rest... (he is a leader of all the makuta) an ALL powerful makuta! he want all the shards so that the golden mask of POWER. using a scythe like staff of shadows he can cast blasts of darkness. using a dark mask of darkness, he turns into a dragon of darkness so he can use powerful attacks using all the powers the makuta have.