Yukina

Yukina (雪菜) is the kind, thoughtful, and somewhat naïve twin sister of Hiei. Yukina was born as an ice apparition (Kōrime, 氷女, literally Ice Woman), who have abilities relating to snow and ice, light healing abilities, and tears that become valuable gems (known in Japanese as the hiruiseki stones). At some point, Yukina was kidnapped by an associate of the BBC, but gets rescued by Yusuke, Kuwabara, Botan, and Hiei. Yukina later finds out about her brother, and searches out to find him, she asked Hiei to help since Hiei seems to be of the same tribe as the description of her brother. Yukina is also the love interest of Kazuma Kuwabara, and while she is not aware of this, unlike most characters she prefers to address him by his given name, Kazuma. At the end of the manga, she is currently living with Kazuma and his family, but in the anime, she stays with Genkai. Hiei is said to be her twin, but he never told her instead during the Three Kings saga he tells her that her twin might be dead and that she should give up looking for him.

Source: Wikipedia