Pewku

Pewku was Orkahm's favorite ussal crab in Metru Nui.When she went to Mata Nui,Onepu took her.She later was handed over to Takua,and helped him and Jaller find the 7th toa,who was Takua the whole time.

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