Rukia Kuchiki

Rukia Kuchiki (朽木 ルキア, Kuchiki Rukia) is the lieutenant of the 13th Division under Captain Jūshirō Ukitake. Rukia is the younger sister of Hisana Kuchiki, the adoptive sister of Byakuya Kuchiki and a friend of Ichigo Kurosaki.
Short and petite, Rukia has pale skin, violet-colored eyes and black hair, with one strand of hair always hanging between her eyes. Byakuya has said to Rukia that she strongly resembles Hisana Kuchiki. As a Shinigami of the Gotei 13, Rukia wears a standard Shihakushō. As a lieutenant, Rukia has her hair cropped into a bob that hangs about her face. Her uniform's short arm-sleeves wears fingerless white tekkou that are similar to Byakuya's but extend to above her elbows.
Initially born into a lower class, Rukia retains her modesty even as an adopted member of the nobility. She is graceful and "clean", yet chooses to talk to ordinary people. However, her cool and lone demeanor often forces her to hide her personal troubles even from her friends. According to Ukitake, Rukia never opens up her heart and has difficulty making friends. Rukia is clueless about the ways of the modern Human World. She is an accomplished actress, being able to act her way through a number of tough situations, such as getting out of trouble with school teachers or convincing the Kurosakis to let her stay at their house.
 Rukia always has trouble finding clothes that fit her, especially when inhabiting a Gigai in the Human World, leading to her stealing clothes from Ichigo's sister, Yuzu. She likes to climb to high places. Rukia also likes everything that is rabbit-themed or resembles a rabbit. People often have difficulty understanding her drawings, which are typically rabbit-like. Rukia's favorite foods are cucumber, eggs and rice dumplings.

Shikai:
Its Shikai command is "Dance"  (舞え, mae).  Rukia holds her Zanpakutō out in front of her and turns it in a circle counter-clockwise. While she is turning it, the blade, hilt and tsuba turn completely white. The tsuba becomes a hollow snowflake-like circle and a white ribbon forms from the pommel.  Sode no Shirayuki is regarded as one of the most beautiful Zanpakutō  in the Soul Society.  The transformation comes along with a rush of cold air in all directions.

Shikai Special Ability:
Sode no Shirayuki is a Ice-Type Zanpakuō, much like Tōshirō Hitsugaya's Hyōrinmaru, but uses it in a different manner.  Like Kaname Tōsen's Suzumushi and Kisuke Urahara's Benihime, Sode no Shirayuki possesses more than one ability in Shikai. Sode no Shirayuki's abilities are labeled as "dances" by Rukia. Besides ice techniques, Sode no Shirayuki's general ability is freezing.  Rukia can freeze a target from a distance  or used in a different manner, create a path and a platform of ice in air.

Some no mai, Tsukishiro (初の舞・月白, First Dance, White Moon):
Rukia calls out the name of the dance while holding her Zanpakutō upside down. The blade glows and then she makes a slashing motion when her target is in position. When she does this, she draws a circle with the tip of Sode no Shirayuki, the space within that circle and anything inside freezes.  The circle not only freezes the ground but everything within the circle's influence including anything above it up in the air, creating an extending pillar of light that then freezes all within in the circle. Shortly after being frozen, the victim then shatters along with the ice.  The ice pillar won't shatter if the victim isn't caught within it.

Tsugi no mai, Hakuren (次の舞・白漣, Next Dance, White Ripple):
Rukia calls out the name of the dance and punctures the ground once creating a large ice circle similar to the first dance, then she punctures the ground in front of her four times in a semi circle. She takes a battle stance as the ice particles begin to flow up from the punctures she made in the ground. The particles build up at the tip of Sode no Shirayuki and is then released as a powerful large avalanche of cold air. It flash freezes whatever it comes into contact with encasing it in ice.

Info from :  http://bleach.wikia.com/