Byakugan

The Byakugan is the dōjutsu of the Hyūga Clan. It is considered to be among the "Three Great Dōjutsu". Unlike the Sharingan and the Rinnegan, which must be inherited in some manner, the Byakugan is present in all Hyūga from birth. Its power lies in its ability to see into and through all things, as well as granting its users a near-complete 360º field of vision.
==Evolution==
Normally, the Byakugan offers select traits to members of the Hyūga Clan. The majority of which are listed below, and are inherent to every member of the clan.
*+2.5 to a character's Perception.
*Can perceive chakra, distinguish sources, and see tenketsu of a human body.
*Near 360º field of vision.
===The All-Seeing White Eye===
The eyes of the Byakugan are able to perceive on a level completely unique to them. Part of this power allows users to view things from impossible distances, even when there are obstructions in the way. This X-ray like vision does not come without a cost however. By focusing on one specific area, they temporarily lose the ability to look around themselves. There are two measurements that will be important throughout a clan member's use of the Byakugan. First is their passive sight range, and then second would be their active sight range. P.S.R and A.S.R. P.S.R refers to the regular 360º that a Byakugan user can naturally see. This requires no activation, and passively represents how far someone can see naturally. While using P.S.R, certain traits of the Byakugan aren't active. In particular, its ability to see through walls or other obstacles. It isn't until your character enters their A.S.R that they can use this ability.
*P.S.R: Every 1 point in Perception equals 2.5 yards in P.S.R range.
Upon entering A.S.R (Active Sight Range), the user gains all traits of their clan's dōjutsu. As well as this, their range of sight increases dramatically. However, at the cost of this, they can only focus on one exact area at a time. Meaning they cannot simply see everything all around them with their active Byakugan. Actively using this costs 2 points of Physical Energy to initiate, and only 1 point to maintain.
*A.S.R: Every 1 point in Perception equals 10 yards in A.S.R range.