Deevfat
this guys data is unknowed.
Tuatsu
Tuatsu was the only Matoran who could speak to Rahi and told them to stop attacking Matoran but Whenua didn't like and sent him away bit then he went to Karda Nui but was Attacked by Shadow Leeches and turned into a shadow Matoran. He didn't go to Metru Nui he just went strait to Karda Nui.
Koishatu
A lonley fellow who spends most of his time looking after Rahi but got killed when attacked by a infected Nui-rama