Dume

Dume is the wise elder of Metru Nui and a former Toa of Fire; he has led Metru Nui for roughly sixteen thousand years.

History
Dume was a Toa for thousands of years, during which he primarily fought Rahi and against the Dark Hunters. 17,000 years before the Toa Inika reached Voya Nui, Dume saved the life of a Ta-Matoran crafter named Lhikan. Some time within the next 2,000 years, Dume became a Turaga, and was then appointed as the Turaga of Metru Nui. The identity of his predecessor remains unknown. In the time leading up to the Great Cataclysm, Dume was abducted and secretly replaced by Teridax, who took on Dume's appearance to fulfill his sinister goals. Turaga Dume was imprisoned in a container beneath Po-Metru. He was awakened and freed sometime during the Visorak's conquest of the city (that story has not yet been told, but apparently his canister malfunctioned, freeing him). In the thousand years while the Matoran were on Mata Nui, Dume and the Rahaga fixed any damage to the city that they could, and Dume also studied the stars. When the Matoran returned to Metru Nui, he told the Toa Nuva what he discovered the stars were saying: Mata Nui was not only sleeping; he was dying. Dume sent the Toa Nuva to Voya Nui, where they could find a Mask of Life that could save Mata Nui, but decided not to tell the Matoran of his discovery to save them from worry - a decision that led Jaller to declare a citywide strike because he was tired of the Turaga secrets.

Tools, Powers, and Abilities
Dume wore the Kanohi Kiril, the Noble Mask of Regeneration, which allowed him to repair inanimate objects and buildings, but not heal living things.

He was also a Turaga of Fire, meaning he had a very small amount of elemental energy, more then a Matoran, but less then a Toa.

Behind the Scenes
The set of Toa Norik was originally designed to be Toa Dume, which explains why they have the same mask (although Norik's mask was recoloured and assigned a different power)

Appearances
BIONICLE Adventures 3: The Darkness Below(mentioned only)

BIONICLE Adventures 4: Legend of Metru Nui

BIONICLE Legends 1: Island of Doom

BIONICLE Legends 2: Dark Destiny