Yashamaru

was a medic-nin from Sunagakure, and as the younger brother of Karura, he is also the maternal uncle of Temari, Kankurō, and Gaara.

Background
After his sister was sacrificed to seal the One-Tailed Shukaku, Yashamaru began taking care of Gaara. At first, Gaara thought that Yashamaru was the only one that cared about him. Yashamaru taught Gaara about physical pain, emotional pain, and love - concepts Gaara was completely unaware of in his childhood. In reality, however, Yashamaru hated Gaara, never having been able to get over the loss of his sister. When the Fourth Kazekage asked him to assassinate Gaara, Yashamaru willingly accepted the command in order to avenge Karura. The assassination attempt, however, ended in a desperate suicide mission and ultimately failed. His suicide bombing attempt on Gaara's life caused Gaara to become somewhat psychotic. Yashamaru's last words, to Gaara, were, "This is it. Please die." This left Gaara to become even more of an emotional wreck than he already was.

Personality
dude, dis guys balls r totally inert

Abilities
As a medical-nin, Yashamaru is very adept at manipulating chakra, as seen with him controlling kunai in midair.

Trivia

 * In the Polish, Brazilian and Italian versions of the Naruto manga, Yashamaru is portrayed as female rather than male. Even in the English anime, there is no clear indication of his gender, despite the fact that he is voiced by a man.
 * Yashamaru's name, 夜叉丸, is composed of three Kanji. The first two, Yasha (夜叉) refer to creatures in Japanese mythology known as "Night Demons" (See Yaksha ). The Hindu version of the Yakshas usually portray them as having two sides: a darker, more sinister side, and a benevolent, lovable side. Yashamaru's betrayal could be a reference to this "dark side" of Yakshas. Maru (丸) is a common ending for male names.
 * Yashamaru shares similarities with Iruka Umino:
 * Both were born in the same month
 * Both graduated to genin and chunin at the same ages: 11 and 16
 * Both lost family to the demons of their respective villages
 * Both became the first "precious person" to the respective jinchūriki of their villages
 * Yashamaru, along with many other characters within the Naruto series, made a cameo in the ending omake of Shippūden Episode 129.