Chakra: 30 (-5 per turn to keep active)
One of the Three Great Dōjutsu (San Daidōjutsu), the Byakugan is the kekkei genkai of the Hyuga clan. Bearers of this Dõjutsu have almost featureless white eyes. When the Byakugan is activated, the user's pupils become more distinct, and the veins near their temples bulge as the blood flow to their eyes is increased. While having the Byakugan deactivated, Hyuga ninjas have a normal eyesight and no special addition to their vision. While low rank Hyugas will need to perform a sequence of hand seals ( Horse → Tiger with lifting just index fingers → Boar with nearly straightened fingers → Hare → Rat → Dog → Horse → Dog → Hare → Rat → Boar with nearly straightened fingers → Snake with the right index finger lifted straight up) to activate their Byakugan, Hyuga masters will be able to do so without the need for any hand seals and even have it active passively for long periods of time. Once activated, the user gains access to all of the abilities the Byakugan bestows upon them. While, like other Dojutsu, its main ability is to see chakra and the chakra flow in sentient beings, the Byakugan adds a complete new detail and dimension to that ability. The user can not only see chakra and the chakra flow, but also the circulatory system and even the 361 tenketsu. Added to this ability, once activated the Byakugan grants the user a near perfect field of vision 360º around himself (up to long-range if he's a master). This field of vision has only one blind spot, slightly above the 3rd thoracic vertebrae and facing backwards but enables the user to actually even see his own chakra circulatory system and chakra flow, which explains why all Hyuugas are so adept and masterfull of precise chakra control. The last ability the Byakugan has is the ability to zoom in and out, focusing on specific things, piercing beyond matter and energy alike, as well as chakra. This specific ability allows the user to see pass most barriers as well as physical matter (like rock walls, ground, etc) but also energy, being able to focus beyond chakra that might be in front of them or other energies. The zooming ability is enhanced as the user becomes more adept at using his eyes and can even reach distances above 20kms away. Some Hyugas have shown a great awareness regarding agressiveness as well as killing intent, detecting such intentions and emotions from others with more ease than most.
Note: Activation spends a move from the users own move count but once the user reaches Sannin Rank and has gained mastery over Gentle Fist for 1 month, he can activate it passively without spending a move. Because of its low chakra cost to maintain, the user can keep it active throughout the whole fight as long as he has chakra and stamina to do so.
Note: Genjutsu that requires Eye Contact when used against a Byakugan user requires direct eye contact between enemy pupil and user's pupil
Note: Must be activated to use Gentle Fist (Jyuken)
Note: Cannot be blinded by matter, chakra, light or energy
Note: Its tracking abilities are similar to that of a 3 Tomoe Sharingan