The Yuki-onna is a beautiful Japanese creature. She appears on snowy nights as a tall, beautiful woman with long hair. Her inhumanly pale sometimes transparent skin makes her blend into the snowy landscape. She sometimes wears a white kimono, but in other legends she is naked, with only her face and hair standing out against the snow. Despite her inhuman beauty, her eyes can strike terror into mortals. She floats across the snow, leaving no footprints (in fact, some tales say she has no feet) and she can transform into a cloud of mist or snow if threatened.
Some legends say the Yuki-onna, being associated with winter and snowstorms, is the spirit of someone who perished in the snow. She is at the same time beautiful and serene, yet ruthless in killing unsuspecting mortals. Until the 18th century, she was almost uniformly portrayed as evil. Today, however, stories often color her as more human, emphasizing her ghost-like nature and ephemeral beauty, more of a vengeful victim then an evil creature.
In many stories, Yuki-onna appears to travelers trapped in snowstorms, and uses her icy breath to leave them as frost-coated corpses. Other legends say she leads them astray so they simply die of exposure. Other times, she manifests holding a child. When a well-intentioned soul takes the "child" from her, they are frozen in place. Parents searching for lost children are particularly susceptible to this tactic. Other legends make Yuki-onna much more aggressive. In these stories, she often invades homes, blowing in the door with a gust of wind to kill residents in their sleep, but she must be invited in first.
What Yuki-onna is after varies from tale to tale. Sometimes she is simply satisfied to see a victim die. Other times, she is more vampiric, draining her victims' blood or "life force." She occasionally takes on a succubus-like manner, preying on weak-willed men to drain or freeze them through sex or a kiss.
Like the snow and winter weather she represents, Yuki-onna has a softer side. She sometimes lets would-be victims go for various reasons. In one popular Yuki-onna legend, for example, she sets a young boy free because of his beauty and age. She makes him promise never to speak of her, but later in life, he tells the story to his wife who reveals herself to be the snow woman. She reviles him for breaking his promise, but spares him again, this time out of concern for their children (but if he dares mistreat their children, she will return with no mercy. Luckily for him, he is a loving father). In a similar legend, Yuki-onna melts away once her husband discovers her true nature.
The Yuki-onna is both illusive and a force to be reckoned with, beautiful and downright scary. This creature is certainly an interesting one, embodying all the characteristics of winter.
(much of this information was gathered from the site wikipedia.org)