Uranos is a dwarfish strongman and the God of the Sky appearing only in Skyworld's Fortress. He moves like a Shulm, slow and deliberate, easy pickings for Pit as long as he's not completely careless. The manual totes him as being a powerful and unique enemy, but he's actually very easy to avoid or defeat, though the red variety have high health.
He may have been based off Uranus, who was a primordial of Greek mythology who is said to be husband and lover of Gaia, the Mother Earth. Uranus is also the father of the Titans and the grandfather of the Olympian Gods.
Although the official artwork seemingly depicts Uranos having the ability to breath fire, he does not display this skill at all in-game.