Kō Hyūga

is a shinobi of Konohagakure and a branch member of the Hyuga clan.

Invasion of Pain
He is the protector of Hinata when Pain attacked Konoha, because Hanabi and Hiashi Hyuga were on a mission. As Hinata tried to help Naruto, Kou called her back claiming that she would only be a burden to him.

Trivia
Kou is the first Hyuga clan member shown with blonde/white hair.