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Dai Kaioshin (大界王神)Grand Supreme Kai (大界王神, Dai Kaiōshin; lit. "Grand Kaioshin" or "Grand God King of the Worlds"), or Daikaioh in the FUNimation dub, is the highest of all Supreme Kais and rules over the entire universe before the series takes place. He is only seen in Eastern Supreme Kai's flashback.
[Spoiler]When Majin Buu comes to the planet, Grand Supreme Kai manages to save the (Eastern) Supreme Kai from Buu's attack and unleashes a powerful attack of his own that literally blasts Buu into pieces. However, Grand Supreme Kai gets absorbed seconds later. After Grand Supreme Kai was absorbed, Buu takes a form that looks remarkably similar to Grand Supreme Kai. This "fat" Buu would continue to show Grand Supreme Kai's spirit within him and later even becomes Mr. Satan's friend. Grand Supreme Kai's presence within Buu pacifies him.[spoiler]
(Source: Dragon Ball Wikia)