Rasa

The was the previous leader of Sunagakure.

Background
Because the Land of Wind's daimyō cut down Sunagakure's budget and instead used Konohagakure's less expensive services, the Fourth Kazekage saw his own village in danger of extinction. In order to prevent that, he decided to focus on increasing the quality of the ninja in the village. As such, he ordered Chiyo to seal the One-Tailed Shukaku within his youngest son, Gaara, so that he could become Suna's ultimate weapon, at the cost of his wife's life. He then taught Gaara ninjutsu, but assigned Yashamaru to be Gaara's caretaker.

However, as Gaara grew and his abilities began to manifest, the Fourth realized that this had been a poor choice, and started to view Gaara as a failed experiment that threatened the inhabitants of Suna, due to Gaara's unstable nature of attacking citizens unintentionally. In time, the Fourth began issuing orders for Gaara's assassination, none of which were ever successful. After Yashamaru's failed attempt, and Gaara began to have more control over his powers due to his new ideals of being alone, the Fourth Kazekage learned to appreciate Gaara's usefulness, and stopped issuing attempts on his son's life, in hopes of him becoming a powerful tool.

Personality
The Fourth Kazekage cared deeply about the well-being of his village, so much so that he was willing to ally with Orochimaru to destroy Konohagakure to bring Sunagakure's resources back up, despite knowing Orochimaru is a highly dangerous criminal. This turned out to be a fatal mistake on the Kazekage's behalf, as he and his bodyguards were betrayed and assassinated by Orochimaru.

In his family life, however, the Fourth Kazekage seems to be much more cruel and uncaring, as he was fully willing to sacrifice his wife's life to turn his third child into a monster who will be destined to a prejudiced life. When he saw Gaara's lack of control being a danger to the villagers, he blamed the child for it and attempted to have him assassinated, despite it being the father's fault for creating such a monster in the first place. He also spent little time with his son, instead placing him in the care of his brother-in-law.

Abilities
While he has not been seen in combat, the fact he was a Kazekage as well as the fact he was placed in a group with the Second Mizukage, Second Tsuchikage and Third Raikage, all of whom were incredibly powerful shinobi, implies that he himself is quite powerful.

Invasion of Konoha Arc
When Orochimaru approached Sunagakure with the proposition of joining forces in invading Konohagakure, the Fourth Kazekage agreed. With Sunagakure still suffering from the daimyō's budget cuts, the Fourth hoped a successful invasion would prompt additional funding. He planned to have Gaara unleash Shukaku from the center of Konoha during the Chūnin Exams, giving the invaders an advantage from the get-go.

The Fourth, however, would not be able to see his plans through, as Orochimaru killed him by impaling his chest with the Sword of Kusanagi. His guards were killed along with him. He then impersonated the Kazekage until the invasion began, making it easier to control the village. After the failed invasion, Baki and some other Sunagakure ninja found the Fourth Kazekage's and his bodyguards' corpses decomposing out in the desert, their faces stolen. Gaara, whose life was made miserable by his father, would later succeed him and become the Fifth Kazekage.

Shinobi World War Arc
The Fourth Kazekage is resurrected by Kabuto, along with other deceased Kage through the Summoning: Impure World Resurrection, to prepare for war.

The Fourth Kazekage was later summoned by Mū once he had been discovered by the Fourth Division, along with the Second Mizukage and the Third Raikage. During the conversation between the four of them, the Fourth Kazekage told Mū and the Second Mizukage that they had been dead for many, many years, and that Orochimaru also knew the Second Hokage's Summoning: Impure World Resurrection technique. While the other Kage spoke about wanting to fight each other, the Fourth Kazekage noticed his son's Third Eye technique observing them.

Trivia

 * His hair color was a dull purple color in his first appearance, but it is brownish in other appearances.