This is Scraps, a member of the Okotan Guardians.
Who are the Okotan Guardians? They were a group of individuals, brought together by the Toa. They trained under them, eventually being named honorary Toa by Ekimu. They were sent on a mission to obtain the stolen Mask of Imitation. Three members of their Toa team were killed in the battle.
When they returned to the city of the Mask Makers, it was under attack from strange corrupted beasts. They helped fight off the beasts, and when Ekimu returned, the surviving members abandoned their Toa titles to honor their masters, and formed the Okotan Guardians.
Now onto Scraps specifically. Scraps was the honorary Toa of Stone. And he looked more like this.
But his original body and his Mask of Regeneration were both destroyed in the battle for the Mask of Imitation. He was brought to Korgot, who had to build him a new, completely robotic body, and install his consciousness into it.
Because of this, Scraps suffers from a few glitches. Primarily, his speech doesn’t always work properly, causing him to mispronounce words. He also doesn’t think much before he speaks.
Despite his flaws, Scraps does his best to support his team, and protect his people.