The Hyuga Clan - WIP

The first and foremost used ability of the Byakugan gives the user a near 360º field of vision, except for up to three blind spots at the back of the neck above the third thoracic vertebra, the center spinal cord and the tip top of the skull. These spots while small in margin if noticed by an enemy could spell death due to possibility of not sensing an attack from these areas of lapse.

The second ability is being able to see through solid objects(except things like Seki Seki), as well as some degree of telescopic sight. The distance and the degree of telescopic sight varies from person to person, and can be improved by further use of the Byakugan, training and also by improving one's Mentle Deduction.

The third and greatest ability is to be able to view someones spiritual energy and spiritual pressure that flows through their body. Yet this is also a double edged sword. When fighting with the Byakugan, someone like Kenpachi Zaraki who releases his power completely by removing his eyepatch would cause such an amazing flash of light from the sudden spiritual pressure and energy that the user of Byakugan could fine their eyes blinded temporarily and bleeding from the intense pain and light it will bring. These effects also can be brought about by the use of Bankai or an equivalent such as Resereccion. While a user may close their eyes to avoid such a flash, if they have power equivlent to Kenpachi Zaraki or Spiritual Powers that burn brightly in normal vision, opening their eyes for too long would cause the blindness anyway.

On the bright side, no pun intended, one can train their eyes to not be effected for long by the blindness or have trained themselves to fight without their eyes in emergency. Yuu Kanda is currently the only one who could possibly not be affected much if at all by any of these setbacks due to his level of use being the top dog so to speak. One would train by sudden exposure to a massive amount of spiritual power right before their eyes.

Another issue is that during use of the Byakugan, all your senses combine and if you cannot see them you cannot hear, taste, feel, sense or smell them. This is the most grave murderous set back of the Byakugan that may be dealt with through extensive use and training, but the only way to get around this would be to close ones eyes. Thus, opening all your senses again. You may also deactivate the Byakugan by using a hand seal consisting of slapping your hands together in prayer form. The same seal activates the Byakugan when you push spiritual energy and pressure into your eyes.

To do this, the user surgically injects a certain amount of their own spiritual energy into the opponent's spiritual energy circulatory system, causing damage to surrounding organs and internal bleeding varying in degrees of damage that are in the Area of Effect in the spiritual energy circulatory system. Even the slightest tap can cause severe internal damage, or possibly kill if the heart is hit. This is a dangerous fighting style to go up against due to the possibly of having so many internal injuries and ruptured organs while not being able to heal quickly enough to sustain more damage.