The Hyuuga clan were one of the founding noble families of Leaf village. The clan itself is said to be the ancestors of the Uchiha clan who possess the bloodline of the Sharingan eye. Each clan member possess the "Byakugan" or "White Eye." When the "Byakugan" is activated, the clan member gains an extra-sensory perception, which gives them penetrating sight and telescopic vision. This allows them to see the internal chakra circulation system in other beings. This vision also grants the member a near 360° view of their surroundings. The higher the skill of the clan member, the further the distance from which they can sense incoming attacks. Unfortunately the vision does have a weakness, a small blindspot that extends outwards from their upper back.
Byakugan Activated Clan Member Eye
Once the eye is fully activated, the hidden iris becomes more apparent. Also when providing blood and chakra for the eyes' bloodline vision, veins will bulge lateral to each eye.
Hyuuga Hanabi

Hyuuga Hanabi is the younger sister of Hinata.
Hyuuga Hiashi

A Jounin from Leaf Village, Hyuuga Hiashi is the head of the main Hyuuga family and the father of Hyuuga Hinata and Hanabi.
Hyuuga Hinata
A Genin from the village of Konoha, Hyuuga Hinata is the heir to the main family of the Hyuuga Clan line.
Hyuuga Hizashi
A Jounin from Leaf Village, Hyuuga Hizashi was the father of Hyuuga Neji, he died previously nine years previously.
Hyuuga Neji

A Genin from the village of Konoha, Neji is the heir to the Branch family of the Hyuuga clan. This clan is known for its ability to use the Byakugan, a unique eye ability that lets the user view the internal chakra highway of his or her opponent.