Kekkei Genkai are abilities passed down genetically in specific clans. Most clans have developed special jutsu related to their kekkei genkai (like Haku's Demonic Ice Mirrors or Kimimaro Kaguya's Dance of the Seedling Fern). Kekkei genkai and their related jutsu cannot be taught or copied by others, as they require the specific genetic trait to work. Kekkei genkai abilities that work via the user's eye are called dÅ�jutsu (çž³è¡“, dÅ�jutsu? "pupil techniques"), such as the Byakugan and the Sharingan.
Naruto Advanced Bloodlines
In the Naruto anime and manga series, a kekkei genkai is any property passed down genetically through a specific clan that cannot be imitated or duplicated by any normal method, although it might be possible to copy it using genetic manipulation or organ transplantation. Kekkei genkai are often beneficial, and are employed commonly by shinobi to improve their chances in battle or other challenging situations.
The eagerness with which the rulers of nations have taken advantage of shinobi with bloodline limits for the purposes of furthering war efforts has taken its toll on their reputation, to such a degree that many in the Naruto world automatically associate bloodline limits with war and pain. It eventually reached the point of outright fear and hatred, resulting in witch-hunts and systematic murders of families and individuals with bloodline limits, as was the case with Haku's tragedy.
The Byakugan is a special pupil condition that naturally occurs in members of the Hyuga clan (and thus only characters from the Hyuga clan possess it). Byakugan users are characterized by their lavender, pupil-less eyes. When the Byakugan is activated, their pupils appear and the veins near their temples bulge...Read More
Haku's kekkei genkai, Hyoton allowed him to combine wind and water-based chakra to create ice, which he could manipulate through willpower alone, as seen in the anime from a flashback where he was manipulating water in his hands and again when he uses water to create a field of icicles through his house by freezing water...Read More
Kurama clan's kekkei genkai:
Introduced in the filler saga of the anime, every few generations a member of the Kurama clan will be born with an incredible talent for genjutsu. The clan member's talent in that field is such that their genjutsu is completely irresistible, so much so that only knocking a person out cold has any chance of awakening them from it. Furthermore, the genjutsu is so powerful that it literally convinces the brain to copy anything that happens to the victim within the genjutsu, making it possible for the clan member to kill their opponents with genjutsu. Such frightening power is not without its drawbacks, however. The user can rarely control the full extent of their abilities, and as such their subconscious will often regulate that power, leading to the creation of a second personality in control of that power. This personality then overwhelms the original, turning the individual into a monster that's a danger to everyone around them.
The Mokuton techniques are initially used by the First Hokage, and it is said that because of his unique ability he was chosen as the First, and that he used his wood type techniques to create Konoha village. Yamato, who received DNA from the First as a result of an experiment done by Orochimaru, also demonstrates the ability to use Mokuton jutsu...Read More
The Rinnegan is the most revered of the three great eye techniques. The Rinnegan is characterized by a number of concentric circles around the pupil of the user. Its power is said to be enough to save or destroy the world, although what sort of powers and techniques this entails have not been stated. It was first possessed by the Sage of the Six Paths, said to be the founder of the ninja world. The first ninjutsu were derived from his abilities. Pein, the current and only known user of the bloodline, first activated it during his childhood to save one of his friends, Yahiko and is also noted by Konan that Pein has never lost a battle probably referring to his Rinnegan eyes.
Ranmaru's kekkei genkai:
Ranmaru, from the filler arc of the anime, has a kekkei genkai ability similar to the Byakugan and Zetsu's spying technique, but arguably better than both. Its powers allow him to see through solid objects and create illusions with chakra circulatory systems, which allows him to fool Neji's Byakugan. It also allows him to interfere with the workings of the Byakugan, and has other vaguely defined powers regarding vision. When activated, Ranmaru's eyes momentarily glow red. Not much else is known about his bloodline limit.
The Sharingan is a special type of pupil condition that naturally occurs in all members of the Uchiha clan, though not all of them gain the ability to use it. Itachi hints at some dark ultimate purpose behind the Sharingan, which both he and Sasuke apparently know, but the series has yet to reveal exactly what that purpose is. The Sharingan is thought to be descended from the Byakugan, but grants the user different abilities and a different insight...Read More
Shikotsumyaku is the kekkei genkai of the extinct Kaguya clan, which gave them the frightening ability to manipulate their own skeletal structure. They had free control over the cells responsible for bone growth and replacement, allowing them to manipulate their bones at will. They could protrude their bones out through their skin, change their bone density, and could even completely regenerate a lost bone...Read More
Souma no Kou:
Sakon and Ukon of the Sound Four have the ability to unify some or all of one's body with the other's body with Souma no Kou ("Attack of an Evil Spirit Pair"). Typically, Ukon is dormant in Sakon's body, with his head protruding from the back of Sakon's neck. In heated battles, Ukon can lend his arms or legs (literally) to add force to Sakon's physical attacks, and even split completely into two bodies. They can also merge with an opponent's body with Parasite Demon Demolition Technique, gradually killing their new host. The brothers can switch places if need be, but Ukon notes that it is not something he is used to and thus makes them weaker.
Exploding Clay: (Possible kekkei genkai)
Deidara possesses mouths in the palms of his hands, which can chew up clay and sculpt it into a number of artistic, and usually explosive, forms, thus the name "exploding clay". Deidara can create clay and make the clay explode by saying "Katsu". It's unclear if this is a kekkei genkai, or merely a secret technique akin to Kidomaru's six arms