Ultimecia is the main antagonist of the game Final Fantasy VIII. She drives much of the story, albeit from behind the scenes. Throughout much of the game, she merely possesses other sorceresses in order to compress time and return to her own body and rule the world.Rinoa Is Ultimecia. A popular theory for Final Fantasy VIII is that the deuteragonist and love interest of main character Squall, Rinoa Heartilly, is actually the main villain Ultimecia. At a point in the game, Edea asks Rinoa to choose a Knight for emotional support to help deal with her power as a sorceress.