Umbra

Umbra was a giant warrior who lived on Voya Nui: guarding the Ignika, from those who would misuse it. He was appointed as a guardian of the mask by the Order of Mata Nui, though he is not a member of the Order. Anyone who wished to claim the Mask would have to defeat him in battle first, even Order members. It is unknown what happened to him when Voya Nui travelled back to it's original place.

Powers
Umbra's powers are light-based. Umbra wielded a large, double-bladed staff (called the Laser Lance) that could fire lasers: it's also equipped with a Rhotuka launcher that can create hard light projectiles. He wore a powerless Ruru. He also had ultra-speed skates on his feet that allowed him to move at the speed of light. They additionally allowed him to ride on walls and ceilings.

Trivia

 * Umbra used to serve the Hand of Artakha, though he wasn't a member.
 * Umbra is actually not his real name, but one given to him by the Order so that he could fit in with enemies and gain their trust.