Konjiki Ashisogi Jizō
This is the Bankai of Mayuri Kurotsuchi who is the captain of the 12th squad and is also the president of the Shinigami Research Institute. The bankai is a caterpillar with a babies head, It follows mayuri's command. The caterpillar breathes poisonous gas of Mayuri's blood. Which is dangerous to anyone who breathes it except Mayuri and Nemu, his lieutenant and even if the other person doesn't want to breathe it, it will still go inside him. The gas can spread to nearly 200 meters around the caterpillar. The poisonous gas is very deadly as it breaks down the bodies it affects very fast. Mayuri used it against Szayelaporro an Espada and his body started to breakdown immediately. Mayuri can also change the composition of the poison so that no one can create an antidote against it. The bankai can also produce swords from his body piercing anyone who comes near. It also has another form which mayuri modified which is called Matai Fukuin Shotai then it turns into a massive baby. The only weakness of this bankai is that the person affected by the poison can counteract it by using enough reiatsu(spirit energy). Mayuri has also modified it so that if it were to ever attack him it would self-destruct and return to it's sealed state.
Renji Abarai is the lieutenant of the 6th Division working under Byakuya Kuchiki and he is also the husband of Rukia Kuchiki. His bankai is Soo Zabimaru and as Renji himself stated that his zanpakuto is very hard to master. When he activates his bankai he gets a skull on his right arm and he also gets a fur coat. One of its abilities is to turn into a large skeleton arm which follows renji's left arm movement. It is strong enough break people's skull and other bones. Another ability is to form a jaw from reiatsu and then it crushes its opponents with the teeth it also grows. With that renji can also fire a blast with his reiatsu which is strong enough to turn it's opponents into ash.
Hakka No Togame
Rukia Kuchiki is the captain of the 13th Division formerly serving as the lieutenant of Jushiro Ukitake. She is also the sister of Byakuya Kuchiki. Her zanpakuto is an ice based zanpakuto and it's also known as the most beautiful zanpakuto in all of soul society. When she activates her bankai it changes her look and her clothes. Her clothes turn white and her hair turns white and her sword becomes ice. One of its abilities is to increase the area of rukia's reach to turn the temperature to absolute zero. When she activates her bankai a mist appears above which signifies Rukia's reach. If any of her opponents touch her they start freezing and once they're frozen they break in seconds. The weaknesses of this bankai is that it also harms Rukia. When changing the temperature she has to do it slowly or it can harm her. It's very difficult to master even though it's very strong, One mistake and she can be dead. She can't use it for too long as it also affects her body and health.
Toshiro Hitsugaya is the captain of the 10th Division and Hyorinmaru is the strongest ice based zanpakuto in all of soul society. He is also the youngest shinigami to achieve bankai. When he activates his bankai he gets wings from ice and he also gets dragon feet also made from ice. There is also a dragons head attacking the opponent. One of the abilities is to freeze items and when his bankai gets damaged he can regenerate as long as there is water in the air. There is also another form which is called Completed Daiguren Hyorinmaru is when hitsugaya turns into an adult. When anyone touches him in this form they will be frozen in a flash. The only weakness is when there's heat at the level of Yamaji's zanpakuto it will melt and it will be useless. That's its weakness.
Kamishini no Yari
Ichimaru Gin is the former captain of the 3rd Division and he also served as the lieutenant of Sosuke Aizen in the 5th Division. When he activates his bankai the swords form doesn't change. The ability of his bankai is that it extends and he claims that it extends till 13km but he said his zanpakuto is not the longest but it is the fastest one. He said it can extend 500 times the speed of sound. But its bankai ability is not speed or length but it's the ability to turn into dust. When he pierces someone he can leave a piece of his sword in their body which is poisonous and then he can choose when he wants to kill them.
Ichigo Kurosaki is a substitute shinigami of Karakura town. He is the son of the former captain of the 10th Division Isshin Kurosaki or as he was formerly known as Isshin Shiba. His mother Masaki Kurosaki is a quincy. When he activates his Bankai he gets new clothes and his sword gets smaller and it turns black. He along with Kisuke Urahara is the only one to achieve bankai in just three days. He can use Getsuga Tenshou which is a reiatsu induced attack. There is another form to his bankai that is when he becomes Getsuga itself at the risk of losing his shinigami powers forever. After achieving his true bankai he can fire a gran rey cero. Which he used against Aizen. He turned into Getsuga to push Aizen to his limits in which he succeeded to do. It's quite a strong zanpakuto.
Zaraki Kenpachi is the captain of the 11th Division. He is one of the strongest captains in the Gotei 13. When he activates his bankai it releases a huge wave which is strong enough to obliterate massive sizes of buildings. Kenpachi's skin turns red and he gains horns on his head. His bankai gives him more strength, Enough to cut off Gerard Valkyrie arm in a single action and also cuts him from a very far distance. The bankai's weakness is that if he releases far more power than his body can handle his body it will eventually start breaking down one by one. He is known to have inhuman strength and he has a lot of reiatsu compared to all the other captains. His bankai is one of the strongest.
Byakuya Kuchiki is the captain of the 6th Division and he is also the head of the Kuchiki Clan one of the four noble clans. He is the 28th head of the clan. His bankai is very strong. He drops his sword into the ground then infront of him appears an uncountable number of swords and they all turn into cherry blossoms. Even if one cherry blossom touches your body you will get cut. He can also use that to defend himself. His opponent has no chance of running away from it or even defending himself from it. Byakuya Kuchiki is one of the strongest shinigami in soul society. Senbonzakura Kageyoshi is a really strong Bankai.
Katen Kyōkotsu: Karamatsu Shinjū
Shunsui Kyoraku is the current Captain-Commander and the Captain of the 1st Division. He was also the former captain of the 8th Division. He is one of the strongest and oldest captain in soul society. He along with Ukitake was trained by Yamamoto himself. He is very strong considering that he defeated starrk in his released form who is also espada number one only using his shikai. Kyoraku stated he only uses his Bankai as a last resort. His bankai has levels to it. It gets stronger by each level. First any wound Kyoraku has inflicted on his body will appear on his opponents body and vice versa. Then black spots start to appear on his opponents body causing them to bleed a lot. Then both of them go underwater and then they both remain in it until one of them runs out of reiatsu and dies. The last level is when his opponent has a thread near their throat which cut their head off. The only weakness is Shunsui doesn't want to use his Bankai when his allies are around since they will end up getting caught in it. Other than that one flaw it is a really strong and effective Bankai. Probably one of the strongest Bankai's in all of Soul Society.
Zanka no Tachi
Genryusai Shigekuni Yamamoto was the former Captain-Commander and the Captain of the 1st Division. He is the strongest Shinigami in all of soul society. Even Aizen himself stated that Yamamoto's zanpakuto is soo strong that if he were to fight against it directly he would be overpowered. When he activates his bankai his sword takes form of an old katana burned by fire. When his bankai is released all of Yamamoto's flames are in the sword and anything it cuts burns out of existence. But you can't see the flames when he cuts. One of his bankai abilities is when his body heat reaches up and goes beyond 15 million degrees making it impossible for his opponents touch him while he uses his bankai. He can also call the dead bodies of everyone who died by his flames to fight for him. He also has the ability to slash concentrated fire and heat which incinerates anything it touches out of existence. That's why his Bankai is the strongest in all of whole Soul Society.
Byakuya Kuchiki's Bankai
Kyoraku and Ukitake's Shikai
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