Kotoamatsukami

is a massive. According to Sōsuke Aizen, he is the original Hollow.

Appearance
Kotoamatsukami is an enormous Hollow, dwarfing even most Gillian in size. He resembles an in appearance — possessing six arms, each with a golden armband, several necklaces around its neck and upper torso, an elaborate white cloth which hangs around its left side, which obscures his Hollow hole, and a large hakama around its waist. Additionally, he possesses three faces, one on each side of his head, and whit hair which is pinned up in a bun. Unlike most Hollows, he has two skull-like masks, which, instead of covering his face, covers his breast on his upper torso. It also bears a halo, seemingly made of flaming.

History
According to Aizen, Kotoamatsukami appeared 4,000 years before the start of the series, as the first Hollow to have appeared in Soul Society. He was then sealed away by a young Genryūsai Shigekuni Yamamoto.

Influences
, in Japanese mythology, is the name for the first kami to have appeared collectively. Additionally, an is one of the lowest ranks of demigods in Buddhism.

Trivia

 * A being like this is referenced by Genryūsai Shigekuni Yamamoto in the manga, during a flashback shortly before his death, though it is unknown what he was actually referring to. In Second Act, he is, in fact, referring to this Hollow.