The Soul King
The Soul King is officially presented as the ruler of Soul Society, living secluded in the Soul King Palace under constant protection by the Royal Guard. But that's just the surface story. He's actually a godlike being who's been sealed away, and his existence is literally the foundation that holds together Soul Society, the Human World, and even Hueco Mundo—all three realms depend on him existing.
He's also the father of Yhwach, though the circumstances of that relationship are complicated and dark.
Content compiled by AnimeList.moe from publicly available sources.
