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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.
Summary
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.
Gotei 13 Divisions
Each captain has distinct underside color on there robes, each color and who has it is on the list below.
1st Division
Captain- Shigekuni Yamamoto Genryusai
Lieutenant- Chojiro Sasakibe
Insignia: Chrysanthemums - "Truth and Innocence"
2nd Division
Captain- Soi Fon
Lieutenant- Marechiyo Omaeda
Insignia: Tulip - "Seek Nothing"
3rd Division
Captain- Gin Ichimaru (previous)
Lieutenant- Izuru Kira
Insignia: Marigold - "Despair"
4th Division
Captain- Retsu Unohana
Lieutenant- Isane Kotetsu
Insignia: Bellflower - "Those Who Grieve Are Loved"
5th Division
Captain- Sosuke Aizen (previous)
Lieutenant- Momo Hinamori
Insignia: Lily of the Valley - "Sacrifice", "Danger", "Pure Love"
6th Division
Captain- Byakuya Kuchiki
Lieutenant- Renji Abarai
Insignia: Camellia - "Noble Reason"
7th Division
Captain- Sajin Komamura
Lieutenant- Tetsuzaemon Iba
Insignia: Iris - "Courage"
8th Division
Captain- Shunsui Kyouraku
Lieutenant- Nanao Ise
Insignia: Bird of Paradise - "Everything is Obtained"
9th Division
Captain- Kaname Tousen
Lieutenant- Shuhei Hisagi
Insignia: Buttercup - "Oblivion"
10th Division
Captain- Toshiro Hitsugaya
Lieutenant- Rangiku Matsumoto
Insignia: Daffodil - "Mystery", "Egoism"
11th Division
Captain- Kenpachi Zaraki
Lieutenant- Yachiru Kusajishi
Insignia: Yarrow - "Fight"
12th Division
Captain- Mayuri Kurotsuch
Vice Captain- Nemu Kurotsuchi
Insignia: Thistle - "Vengeance", "Strictness", "Independence"
13th Division
Captain- Jushiro Ukitake
Vice Captain- Sentaro Kotsubaki & Kiyone Kotetsu
Insignia: Summer Snowflake - "Hope"
Kido Corps
No known Captain or Lieutenants.
Special Forces
Commander- Soi Fon
Captains unique Hikama-Hino color
1st Division
Yamamoto - royal purple
2nd Division
Soifon - amber
3rd Division
Ichimaru - light bluish-white
4th Division
Unohana - grayish pink
5th Division
Aizen - light green
6th Division
Kuchiki - blue
7th Division
Komamura - brownish tan
8th Division
Kyōraku - rose pink
9th Division
Tōsen - brownish orange
10th Division
Hitsugaya - dark green
11th Division
Zaraki - deep purple
12th Division
Kurotsuchi - dark greenish blue
13th Division
Ukitake - dark rose pink