Kaien Shiba

Kaien Shiba (志波 海燕, Shiba Kaien) was the lieutenant of the 13th Division, under Jūshirō Ukitake until he died.

Personality
Kaien was an upbeat and kind young man from the Shiba house, tattooing his arm with the Shiba house symbol, who treated all his subordinates equally.

Appearance
Kaien closely resembles Ichigo Kurosaki in both appearance and personality, and their resemblance is often brought up multiple times in the series.

History
He was a father/older brother figure to Rukia, whom he taught how to fight and helped her find a place within the 13th Division. He was also a prodigy amongst shinigami; graduating from a six year curriculum in just one year and becoming a lieutenant five years after, around the time Ichimaru Gin killed the 5th division 3rd seat. He was also married to another shinigami, the 3rd Seat of his division, Miyako. One day, however, Miyako was possessed by a hollow and killed her subordinates, leading Kaien to fight the hollow in an attempt to avenge her. Kaien, however, would be controlled by the hollow as well, leading him to almost attack Rukia. Although Ukitake attempted to save her, his disease prevented this. Much to Ukitake's and Rukia's horrors, however, Kaien resumed control and stabbed himself with Rukia's zanpakutō, dying in her arms.

Since his death, the 13th Division has not assigned another lieutenant, and instead is run by two 3rd Seats, Sentarō and Kiyone. Both of Kaien's siblings, Kūkaku and Ganju, became distrustful of shinigami, and due to either Kaien's everyday life or his death the Shiba house diminished from their high status, with only Ganju and Kūkaku remaining. Rukia, who felt the most responsible for Kaien's death, carried a heavy amount of guilt over his death until several years later, when she finally brought herself to apologize to Kaien's siblings. It is later revealed that due to the hollow's special ability, Kaien and the hollow were taken to the Hueco Mundo, where the hollow Aaroniero Arruruerie ate them both and took both their abilities, and with these rose to become the 9th Espada. Rukia would later fight Aaroniero and successfully killed him, finally bringing peace to Kaien's soul.

Zanpakuto
Nejibana (Twisted Flower):


 * Shikai: Its shikai command is "rankle the seas and the skies". Nejibana's shikai is represented as a cross between a trident and a ji (a Chinese halberd) with a crystalline appearance that has the ability to manipulate water. Like the ji, it bears a horsehair tassel, although it is blue instead of the traditional red; similarly the two side blades are straight with concave edges as opposed to the usual crescent blade. During Rukia's battle with Aaroniero, Nejibana's abilities are shown with the ability to use the shockwaves it creates in conjunction with trident attacks to "crush and split the enemy in two." Kaien's techniques and form are also revealed during the battle, and are described by Rukia as "a trident technique reminiscent of dancing."