This is my moc, Shaman Dave.
He is one of the last of his kind, The Forgotten Ones. A species who lived separate to Toa and Matoran, but can not control the elements.
But because of his lack of sanity, (watching your entire people get devoured and burned alive by a volcano is pretty rough), he has learned how to control fire.
(Here's some more pictures:)
Edit: I've made a few changes to him, and now hope he looks better.