Ranmaru

Ranmaru (蘭丸, Ranmaru?) is a young orphan from Kirigakure. He is similar to Haku in many ways, in that he is an orphan, is loyal to one of the Seven Ninja Swordsmen of the Mist, and has an androgynous appearance and soft, almost feminine voice (in the English dub, he has a female voice actor), but he is never mistaken for a girl, in part due to the fact that "maru," a Japanese suffix for boys' names, is part of his name.

Background
Ranmaru grew up with a sickly body, but the farmers living near him gave him food to eat. One day, he used his kekkei genkai, and accidentally revealed witnessing an injury that he otherwise could not have seen. The villagers realized that he was strange and stopped feeding him. Ranmaru became lonely after a while. Not long afterward, Raiga arrived in the course of a mission, and was planning on killing Ranmaru, but Ranmaru revealed his ability and his perception of the sorrow within Raiga. Raiga then carried him on his back, allowing Ranmaru to see the outside world.

Curry of Life arc
Ranmaru was first introduced spotting Rourusuke's party escaping from Katabame Kinzan for Raiga. Raiga and Ranmaru then fought Naruto Uzumaki and Team Guy (minus Guy himself) when they arrived to defeat the Kurosuki family. Raiga initially gained the advantage due to Ranmaru's abilities and his powerful lightning jutsu, but after Ranmaru was knocked away from Raiga, Raiga became distraught over losing him, and Naruto knocked him off a cliff. Ranmaru then revealed his role and past to the Leaf ninja and asked to die. Naruto's group left him in a small shed on the mountain and took him back to the Curry of Life Shop after defeating the remaining Kurosuki family members.

Karashi took Ranmaru on his back, and then brought him to Raiga, who wasn't dead yet. Ranmaru revived him with his chakra, but then passed out, seemingly dead, from doing so, which caused Raiga to demand that Karashi bring him the Leaf genin. Tenten discovered that Ranmaru was alive, and brought him to a shed in the middle of a thunderstorm, trying to cool down his fever. While Ranmaru was willing to die, Tenten told him that he didn't deserve to decide that, as the people he helped Raiga kill could not make that decision. Ranmaru recovered his health, and became able to walk, after eating the Curry of Life and wished for Raiga to eat it.

Ranmaru accompanied Tenten, Sanshou and Karashi to the mountain where Neji, Lee and Naruto were fighting Raiga, and fed the wounded ninja the curry. Ranmaru returned to Raiga and using his mist, tried to trick him into walking over a cliff, in order to atone for his actions. The plan failed when Lee attacked and interrupted Raiga, and when Ranmaru attempted to convince Raiga to stop the battle, Raiga believed that Ranmaru has betrayed him. Naruto rose to protect Ranmaru, and punched Raiga off the cliff through successive attacks with shadow clones. Raiga realized how Ranmaru could never be a truly free soul as long as he depended on him, and gave himself a funeral in one of his more coherent moments. As the arc comes to a close, Ranmaru becomes an apprentice at the Curry of Life shop.

Abilities
Even though he was apparently paralyzed, Ranmaru's kekkei genkai gives him the ability to see through walls, cause illusions, and interfere with even the Byakugan. He can also use some other vaguely defined powers relating to vision. This bloodline does not have a mentioned name, but when used, Ranmaru's eyes glow red for a moment. Ranmaru's powers seem to be the most broad of any kekkei genkai, ranging from perfect illusions that work past any human or bloodline technique, creating and controlling smoke from his body, ability to transfer lifeforce to bring someone mostly dead back to life, and a power of perception that ranges from looking through a wall and analyzing abilities, to pearing into people's very lives and inner conflicts from far away. In japanese lore, Ranmaru's powers actually most closely resemble that of a fox-born, or someone who was born to a parent who was a kyuubi who took the form of a human. One of the only people recorded in japanese history rumored to be a fox-born was 10th century expert in natural science and the occult, Abe no Seimei. In legends, he was also a master diviner and mystic, who's powers closely resembled Ranmaru in the ways of mysticism and magical perception. This would explain why such a kekkei genkai was not supposed to exist, if Ranmaru was one of the first humans to have this ability.