Gotei 13

Bleach Gotei 13 Guide

The Gotei 13 is the name given to the 13 Divisions of the Shinigami in Soul Society. Anyone classified as a Shinigami is put into 1 of the 13 Divisions, whether they are a Captain or Vice-Captain, hold a Seat, or are just a member, they are still an important part of the Division.

Each Division of the Gotei 13 has a Captain and a Vice Captain, they are generally the strongest of the whole Division. To become a Captain, a Shinigami must first have achieved Ban-Kai as one of the prerequisites. The Captain and Vice Captain usually travel together and get along well.

A Shinigami cannot be seen in the human world, they leave Soul Society when they are going on missions to balance the Spirits in the World. Those that can see Ghosts can generally not see Shinigami, but there are exceptions and it is a very rare gift.

Each Shinigami wears black robes with white trimming and a white cloth belt. On special occasions they wear a arm band to signify their rank in their specific Division. The Captain of a Division wears a White Robe with the Number of their Division in Kanji on the back.

Gotei 13
From Bleach Wiki

The Gotei 13 (Goteijūsantai; 13 Division Imperial Guards, 13 Court Guard Squads in the English dub) is the organization which most Shinigami join, and one of the three main branches of military in Soul Society. It is split into thirteen divisions (hence the name), with several divisions having certain specializations. The Gotei 13 is subservient to the edicts of the Central 46 Chambers. They also have no jurisdiction over any of the noble families. The symbol of the Gotei 13 is a rhombus, all the 13 Divisions symbols are placed within the rhombus on the back of the Captains haori. The Kidō Corps, not officially considered as part of the Gotei 13, is still under the authority of the Central 46, and works together with Soul Society, it is why it is actually here, but officially, both Kidō Corps and Onmitsukidō are not part of the Gotei 13.