Pewku

Pewku was Takua's beloved Ussal crab, and a racing legend. On Metru-Nui, Orkham was her caretaker. On Mata-Nui, she was owned by Onepu, and later Takua. She was Takua and Jaller's mount during the quest for the Kanohi Ahvokii.

Non-Canon
When Takua became a Toa, fans speculated her fate. Some say she went to Jaller, Takua's best friend. But Jaller became a Toa Inika, so we can assume she went back to Onepu.