He is of the Hyuuga family which inherits their bloodline "Byakugan" this eye translated to "White eye" in english.
He is known as one of Konoha's genius and he is from the branch side of Hyuuga
His well known techniques are
Hakke Roukushuu Yonshou
"neji's byakugan is more efficient than sasuke's sharingan"
He is very good-looking, with lilac eyes and long brown hair. He is branded with a Cage Mark Seal, mistakingly but routinely called a swastika by ignorant people. The correct terminology is "Manji". It is a Buddhist symbol for peace.
The seal was created to control him and lock away his bloodline trait, or "kekkei genkai", if he was to die so that enemies can not get a hold of it.
He is sometimes mistaken for a girl by other ignorant people because of his long hair. If you ask me, Haku's the one that looks like a girl.
Neji is just sooooooo pretty... I love him so much!!!!!