Nidhiki (DMU)

Nidhiki is the Toa of Air responsible for creating the splinter timeline known as the Dark Mirror Universe.

Dark Mirror
Nidhiki was a member of the Toa Mangai, a large Toa team responsible for safeguarding Metru Nui. When Lhikan discovered that one of their own, Toa Tuyet, was using the Nui Stone to kill Matoran and frame the Dark Hunters, he asked Nidhiki to come with him to confront her. Nidhiki agreed, chiefly because he was curious about the Stone. When he bore witness to the awesome power that the Stone contained, he was presented with a choice: either side with Lhikan and destroy the Nui Stone, preventing anyone from abusing its power ever again, or side with Tuyet and reap the rewards that the Stone could give him. Nidhiki decided to side with Tuyet, creating the splinter timeline known as the Dark Mirror Universe. He killed Lhikan and helped Tuyet establish what would later become the Toa Empire.

Nidhiki faded into obscurity for the most part for the next 3500 years, but remained a high-ranking member of the Empire.

Dusk and Dawn
Following the death of Tuyet, Nidhiki was one of the world leaders summoned by Dume to discuss what would happen to the universe without Tuyet. For obvious reasons, Nidhiki represented what remained of the Empire.