Turaga Matau, one of the wisest of the Turaga, rules the treetop village of Le-Koro.
Source: BIONICLE #1: The Coming of the Toa
Pronunciation: too-RAH-gah mah-TOW
Mask: Kanohi Mahiki, the Noble Mask of Illusion
Tool: Kau Kau staff
Turaga Matau is always calm in a crisis. He is famous all over the island for his sense of humour.
Source: The Official Guide to BIONICLE