Matoran in a Black Suit
The Matoran in a Black Suit was a Matoran who wore a black suit and whose job was to keep people from god-modding.
He had many encounters with the Matoran in White Suits, who hated him very much. On one occasion, they knocked him into a pool of acid, which gave him a speech impediment.
He was killed when the Matoran in White Suits got everyone to go after him.