Yuna's Grandfather. From what I've heard from Jaden, he's a pretty cool guy. I can definatly say Yugi inherited his looks; Timo
Atem is the pharoh, the ruler of Pharoh Kingdom, and father of Prince Yugi. He is a master duelist.
He and his son so far have had a minor role. When Jaden traveled to their world, Atem convinced him to stay and help train his son in dueling. He is the Grandfather of Yuna. In the Future, it is mentioned he Abdicated his throne to his Son, allowing himself to spend the rest of his life as a advisor to him.