Fuen

was a kunoichi who was part of the group of grave robbers who dug up four of the dead Twelve Guardian Ninja. He was the strategist and trap expert of the group, and was widely thought of as the weakest member of the team.

Personality
Fuen was portrayed as having a superiority complex and behaving and looking extremely effeminate. As a strategist, he had a high opinion of his intellect and skills. He was easily bored in battle, and felt overjoyed when an opponent proved themselves capable of surviving the initial phase of his strategy. This was shown from how he had hoped to face Sai again after he outmaneuvered him.

Abilities
Fuen specialized in indirect and misdirection tactics. His most noticeable abilities were how he would draw certain things on his map, thus manipulating any terrain he wanted. These terrains couldn't be returned to normal unless he were to die, roll up his map, or move to a different location. He was also very skilled in genjutsu and poisons as well, being able to combine the two to cause a genjutsu paralysis on the opponent, making it twice as deadly. His final ability was to perform powerful sealing jutsu, as demonstrated with his Barrier Gate Five Seals Technique: Castle Closing Eight Gates. As he relied more on deception and attacking from afar, his close-range combat abilities were rather weak.

Twelve Guardian Ninja Arc
Fuen was first seen with Fudō whilst searching for the graves of the lightning chakra users of the Twelve Guardian Ninja. He appeared again during his team's confrontation with Team Yamato, where he took advantage of Fudo's powerful earth-based jutsu. Utilizing his unique terrain-altering jutsu, he turned the entire battlefield into a giant maze of traps that Team Yamato barely survived.

During the invasion of Konoha, Fuen ensured that no Leaf villagers could escape by summoning a giant barrier around the village. After their plan was discovered, Fuen went off to stop anyone from interfering, and whilst doing this came across Sakura. Fuen managed to trap her in a small rock cave, where he then performed a genjutsu with poisonous moths all over the cave. When Fuen stopped the illusion he stabbed the body, only to find that it was a substitution. The real Sakura then appeared behind Fuen and punched him through a group of trees, immobilizing his body. Sakura then ridiculed Fuen for not being aware of his own limitations in battle and finished him off with a punch, creating a giant crater. With his death the barrier around Konoha was deactivated.