Creator

The Creator is the final boss of The Final Fantasy Legend. He had created humanity, the Tower, and Ashura.

The party meets him several times throughout the course of the game, as he gives hints on how to break the seals on the doors. When they meet in Paradise, he offers them a wish. Offended that he was willing to cause so much suffering in the worlds, they apparently kill him in battle.

Trivia

 * The Japanese Game Guide for Unlimited Saga, when telling the story of Iskandar, does refer to "The Creator". It is very questionable whenever it's the same character, but such a coincidence does still seem unusual.