Yomi

Naruto Shippuuden the Movie
Yomi is a dark medical user who appears in the Naruto Shippūden movie. He is a servant of Mouryō who comes from a long line of followers to Mouryō that have spent generations perfect a dark form of medical Ninjutsu. At the beginning of the movie he gives his men special chakra-enhancement through infusing them with dark-chakra snakes; giving them access to jutsu they could normally not use. After his men took down the guards of Mouryou’s prison, Yomi then enters Mouryō's spirit cave frees him. He then offers his body as a spirit container for Mouryō until the can retrieve Mouryō's body. When Kusuna reports that Gitai was killed by Lee Yomi doesn't care telling Kusuna to kill Neji, Lee, Sakura, and Naruto and then when the time is right to kill Shion. This results in Kusuna and the rest of the gang of four being killed. Shion then confronts Yomi and prepares to seal Mouryō. Yomi interferes however Mouryō wants to take matters in his own hands and bursts out of Yomi's body killing him. Yomi's body then fell in the lava when the volcano erupted. It is unknown if he survived or not, but his condition after Mouryō escaped from Yomi's body would suggest that he is no longer of any threat.

Abilities
Yomi has shown to have great expertise in medical ninjutsu. With ease, he can enhance the chakra of anyone he wishes, allowing to fight for longer periods of time and performed more powerful jutsu. His skill in medical ninjutsu were great enough to effectively (both only for a limited amount of time) use his body as a container for a demonic spirit.