Onepu

(Note: Although Onepu is canonically male, I have left the role open to both male and female actors, since female actors, at least in my personal opinion, can do very convincing "young boy" voices, and I didn't want any prospective female actors to be put off by the character's canonical gender.)

Onepu (pronounced own-KNEE-poo) is the captain of the Ussalry, an army of Ussal crabs that make up the Onu-Matoran branch of the Mata Nui military. He is a skilled Usual crab rider and the right hand of Turaga Whenua, and is often called on for advice. He is the first Matoran to see Toa Onua after his arrival.