From Anime Bleach .
Living up to its name as the most beautiful Zanpakutō in Soul Society, Sode no Shirayuki manifests herself as a beautiful Yuki-onna dressed in white and light blue clothes. She has long, pale blue hair that is clipped at the left side of her head at the front, while on the right it hangs loose and is cut somewhat shorter. She wears a Furisode kimono: The top part of her clothing has long sleeves that reach the ground, and the bottom part is also long and covers her feet. She seems to draw her Zanpakutō from the palm of her left hand.
Her manner of speaking is soft and peaceful, but personality-wise, she is cold and somewhat apathetic, unlike Rukia, who is sometimes stern, but kind. Her reason for leaving Rukia is not feeling appreciated and respected by Rukia. After being released from Muramasa's control, she has displayed a rather kind, friendlier disposition, along with a noticeably more polite demeanor.
Enhanced Speed: Sode no Shirayuki has shown impressive speed, enough to surprise a Flash Step Expert like Ichigo.
High Spiritual Power: Her spiritual pressure was great enough to counter Ichigo while his Bankai was released (though he was holding back).
Ice Form: Sode no Shirayuki has the ability to turn into ice and reform herself.
Ice Generation: Sode no Shirayuki is able to generate ice and cold with a simple gesture of her hand. She also has the ability to generate ice and cold by blasting it from her mouth.
Sode no Shirayuki at any time can manifest a sword that takes the form of her Shikai release state, which is pure white with a hollow snowflake-like tsuba and a white ribbon forms from the pommel from the end of the handle. With this sword she uses the same abilities that Rukia is commonly seen using when but with greater control.
Some no mai, Tsukishiro (初の舞・月白, First Dance, White Moon): Sode no Shirayuki calls out the name of the dance, slashing a circle in the air while performing a brief dance-like movement and holds her sword upside down, a different movement from Rukia's. When she does this, a large ice circle forms around her intended target which freezes everything that touches it. 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 the circle. Shortly after being frozen, the victim then shatters along with the ice.
Tsugi no mai, Hakuren (次の舞・白漣, Next Dance, White Ripple): Sode no Shirayuki calls out the name of the dance, and four bursts of ice build in front of her forming an arc (unlike Rukia, who has to puncture the ground herself). From her sword held out, a massive, powerful pure-white wave of ice from her katana is fired at the target, in turn encasing the target in a block of ice and shattering it.