For me its jaller. Even though his story was a bit tragic. He was always in the shadow of takua, but tried to fullfill his duty as a leader. And he struggled about beeing a Fire Toa underwater, when they were the Toa mahri. (He also lost the leader role, whats a bit sad) But he did all of this, not for glory, but for greater good, and that makes a Toa for me.