Kirop was the former leader of the Av-Matoran in Karda Nui. He was transformed into a shadow Matoran by Chirox. When linked to Chirox, Kirop had the ability to temporarily blind an opponent. Chirox gained the ability to see through Kirop's eyes as long as they were in contact. Thanks to Takanuva, Kirop was transformed back into an Av-Matoran. At the end of story year 2008, Kirop resided on Metru Nui.
With Chirox, Kirop had the power to temporarily rob a foe of sight. This, combined with Chirox's Kanohi Shelek, the Mask of Silence, made them a lethal combination in a fight.