A Ko-Matoran is a Matoran of ice and usually a resident of Ko-Koro or Ko-Metru in the BIONICLE universe. Ko-Matoran had white armor and commonly wore white or light-blue masks. Ko-Matoran in Metru Nui were primarily scholars. On the island of Mata Nui, they were master trackers and trap builders. They tended to be quiet and not very social in both locations.