Bleach Character - Kuchiki Rukia

Rukia died as an infant and was sent to Soul Society with her older sister, Hisana. Though Hisana initially tried to protect and provide for Rukia, she could not ensure her own survival while caring for a baby as well, and thus abandoned Rukia. As Rukia grew up she befriended Renji Abarai, and over the coming years the two stayed together and looked out for one another. Once they entered the Soul Reaper academy, Rukia was adopted into the Kuchiki family. Hisana, having years earlier married into the family and subsequently died of an illness, begged her husband, Byakuya Kuchiki, to find Rukia. Disgusted with herself for abandoning Rukia, Hisana wanted her sister to be part of the Kuchiki family while never knowing of their relation to each other. After succeeding in this task, Byakuya kept his word, treating Rukia as a sister and keeping his wife's secret until the end of the Soul Society arc, where he finally tells Rukia about Hisana's past.

When she was accepted into the 13th Division, Rukia's abilities made her a prime candidate for a seated position. Wishing to keep Rukia out of harm's way, Byakuya used his influence as a captain to make her ineligible for such a position. In time, Rukia befriended the lieutenant of her division, Kaien Shiba, and trained under him. During the course of a mission Kaien was possessed by a hollow and Rukia was forced to kill Kaien to protect herself. While dying, Kaien apologized to Rukia for allowing himself to be possessed and thus putting her in that position. Rukia returned his body to his family, though could not find the courage to tell them how he had died until she learned about Hisana.

(Original writeup is retrieved from wikipedia)

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