Ichijitsu Kawahiru

The is the king of the Soul Society. He is an ageless and timeless individual, living in the Royal Palace, far from his subjects. According to Genryūsai Shigekuni Yamamoto, he is indifferent as to the ruling of Soul Society, having given rulership to the Central 46.

Appearance
The king bears a strong resemblance to his son, Seireitou, with long, silver hair, which flows down to about his mid-back, narrow amethyst-colored eyes, and thick black eyebrows. He wears a white shihakushō and a black, high-collar, haori; garb that is the exact opposite, in coloration, to that of the captains of the.

Powers & Abilities
Ōken Bestowment: The King of Souls is capable of granting those whom he chooses as members of the Royal Guard with the, a special tool that allows one to enter the dimension of the Royal Palace whenever they wish. The king achieves this by literally turning the bones of those he selects as Royal Guard members into this Ōken.

Zanpakutō
It is clear that he has some sort of Zanpakutō, though its name and abilities are unknown as of yet. They take the form of two katana with hexagonal guards and green wrapped hilts. He keeps them tied to his waist on a white obi.
 * Shikai: Not Yet Revealed.
 * Bankai: Not Yet Revealed.

Trivia

 * He is an entirely different person than the King shown in the canon storyline.