Othos’s sheet can be viewed here.
Othos was found frozen in a block of ice in the Elemental Chaos. Upon thawing, he revealed himself as a genasi, an elemental being created by the primordials to be a tactician and warrior. He seems to have a need to indulge those parts of his personality, and with no war being fought, he asked to accompany the Dragonslayers.
Though his strength, skill, and tactical abilities all seem quite sound, Othos does seem rather full of himself. He has not endeared himself to many people thus far.