Gerson was the right-hand Matoran of the Turaga of Shinobi-Nui, but later took on the role of leader himself after realizing that the Turaga was not mentally capable of performing his duties.
When a rock crashed into Mt. Heshima one day, Gerson sent five Matoran (who would later make up most of the Toa Idiotas) to investigate.
Gerson is an Onu-Matoran who wears a powerless Kanohi Faxon. He takes his role seriously, but knows when to cut someone some slack. He is also the most respected Matoran on the island.