The Gotei 13 are the elite Captain and Lieutenants of the Soul Society's Soul Reaper army. Split into 13 different divisions, they keep the peace and battle the Hollows.
The Gotei 13(護廷十三隊, goteijūsantai) are the leadership of the main military force of Soul Reapers(死神, shinigami) in the realm calls the Soul Society. They were created as part of the manga BLEACH that is written and illustrated by Tite Kubo in 2001.
The Gotei 13 is the name given to the group of death gods who have obtained great power; these are commonly known as captains. The captains consist of 13 squads, each with a lieutenant and around 200-500 death god warriors. Besides the 13 squads there are also 3 special groups: the Kido corps which deals in magic conjuring, Special Forces lead by the captain of the 2nd division and dealing with spying and detention/jail, and thirdly the Scientific Bureau .
The Gotei 13 is headed by Shigekuni Yamamoto Genryusai, leader of the 1st division. The Gotei 13 was created to diminish hollows, a creature that eats the souls of humans.
There are three ways to become a captain of the Gotei 13; you must either be able to use Bankai, have the recommendation of 6 other captains and approval of another 3, or defeat another captain with at least 200 witnesses.
Each captain has distinct underside color on there robes, each color and who has it is on the list below.
Captain- Shigekuni Yamamoto Genryusai
Lieutenant- Chojiro Sasakibe
Insignia: Chrysanthemums - "Truth and Innocence"
Captain- Soi Fon
Lieutenant- Marechiyo Omaeda
Insignia: Tulip - "Seek Nothing"
Lieutenant- Izuru Kira
Insignia: Marigold - "Despair"
Captain- Retsu Unohana
Lieutenant- Isane Kotetsu
Insignia: Bellflower - "Those Who Grieve Are Loved"
Lieutenant- Momo Hinamori
Insignia: Lily of the Valley - "Sacrifice", "Danger", "Pure Love"
Captain- Byakuya Kuchiki
Lieutenant- Renji Abarai
Insignia: Camellia - "Noble Reason"
Captain- Sajin Komamura
Lieutenant- Tetsuzaemon Iba
Insignia: Iris - "Courage"
Captain- Shunsui Kyouraku
Lieutenant- Nanao Ise
Insignia: Bird of Paradise - "Everything is Obtained"
Lieutenant- Shuhei Hisagi
Insignia: Buttercup - "Oblivion"
Captain- Toshiro Hitsugaya
Lieutenant- Rangiku Matsumoto
Insignia: Daffodil - "Mystery", "Egoism"
Captain- Kenpachi Zaraki
Lieutenant- Yachiru Kusajishi
Insignia: Yarrow - "Fight"
Captain- Mayuri Kurotsuch
Vice Captain- Nemu Kurotsuchi
Insignia: Thistle - "Vengeance", "Strictness", "Independence"
Captain- Jushirou Ukitake
Insignia: Summer Snowflake - "Hope"
No known Captain or Lieutenants.
Commander- Soi Fon
Yamamoto - royal purple
Soifon - amber
Ichimaru - light bluish-white
Unohana - grayish pink
Aizen - light green
Kuchiki - blue
Komamura - brownish tan
Kyōraku - rose pink
Tōsen - brownish orange
Hitsugaya - dark green
Zaraki - deep purple
Kurotsuchi - dark greenish blue
Ukitake - dark rose pink