Ninjustu

Here are just a few Bloodline limits from Naruto.

The Byakugan, literally White Eyes, is a very special condition of the eye that occurs naturally in all members of the Hyuuga clan. While it is believed that the Byakugan is genetically related to the Uchiha clan Sharingan, it is capable of many things the Sharingan is not and as Hatake Kakashi states, in terms of insight the Byakugan surpassed even his own Sharingan.

Used mainly as a taijutsu technique, the Byakugan gives it's user many great abilities including the ability to have a 360 degree field of vision, except for one tiny blind spot behind the first thoraic vertebra, this tiny spot is the only known weakness of this special ability. With the Byakugan activated it's user has the ability to detect anything that moves around them in a 50 foot radius, making the Byakugan a difficult task to fight against. When used with chakra the Byakugan becomes more powerful and can see through most solid matter over extremely long distances and allows it's user to see the inner coil system of the enemy, opening them to an attack on their tenketsu (Chakra Holes) by the hand of the juken (Gentle Fist). Only very advanced users of the Byakugan such as Hyuuga Neji can use the aforementioned juken technique, but when used successfully it can shut off the chakra flow of the opponent which has disasterous effects.

The Mangekyou Sharingan, literally Kaleidoscope Copy Wheel Eye, is a higher form of the Uchiha clan Sharingan that is only achievable by natural users of the Sharingan, those who have Uchiha blood running through their veins, eliminating Kakashi from potential users. The Mangekyou Sharingan is not easy to obtain however for those who are not made of cold blood as they must make a tremendous sacrifice in order to obtain it, they must kill their best friend. To date only two people out of a possible three people have obtained this legendary eye, Uchiha Itachi and an unknown Uchiha ancestor. The only other person who could possibly attain the Mangekyou Sharingan is Uchiha Sasuke, to obtain this he would have to kill his best friend, presumably Uzumaki Naruto. With the Mangekyou Sharingan activated one major advantage is to be able to use the three most powerful jutsu possible, two of which have been revealed so far: Tsukuyomi and Amaterasu.

 The Sharingan, literally Copy Wheel Eye, is a very special condition of the eye that occurs naturally in some members of the Uchiha Clan. While it is believed to have been derived from the Hyuuga clan Byakugan the abilities of the Sharingan differ greatly from those of the Byakugan. Most notably the Sharingan's most well known ability is to be able to memorize any technique that it has been a witness to including nijutsu, genjutsu and taijutsu techniques. Other abilities of this very special eye include hypnosis, allowing it's user to suggest actions and thoughts to the opponent. The Sharingan also has the very useful ability to see through any illusionary technique.

Unlike the Byakugan, the Uchiha clan Sharingan does not appear automatically at birth in an Uchiha clan member. Instead the Sharingan will typically not show up until the user is faced with a life threatening situation, the Sharingan will activate and help to save the life of the user, and after the first appearance of the Sharingan, the user can call upon the use of the Sharingan at any time he pleases. One interesting fact about the Sharingan is that you can gauge the power of the Sharingan user by counting the dots in the person's eye. One dot would be a beginner, two an intermediate, and three dots are found in each eye of a matured adult Sharingan user. It is not unusual to find a user whose two eyes contain different amount of dots, such as Uchiha Sasuke who initially had two dots in one eye, and just a single dot in the other eye, until eventually both eyes evened out as he matured.