Head Ninja of Kumogakure

This from Kumogakure came to Konoha to sign a peace treaty between the two nations nine years before the start of the series.

Background
This man and the Land of Lightning used the peace treaty signing as an excuse to gain free entry into Konoha to abduct a villager with the powerful Hyūga kekkei genkai - the Byakugan. During the middle of the night, he snuck into the Hyūga clan household and abducted a young Hinata while she slept. However, Hinata's father, Hiashi Hyūga, interrupted him during his escape, and quickly dispatched him. Despite the sinister nature of the visit, Kumogakure demanded Hiashi's head as compensation, or risk breaking the peace treaty and start a war, prompting Konoha to give them Hizashi Hyūga as a body double.