Human Path

This man was a shinobi of Takigakure. Following his death, he became the Human Path of the Six Paths of Pain.

Manga debut: Naruto Chapter #376

Anime debut: Naruto Shippuuden Episode #127

[Spoiler] On the verge of the Second Shinobi World War, he encountered Jiraiya during his journey to find his disciple. After dying years later, his corpse was used by Nagato to channel the power of the Human Path in his Six Paths of Pain. [/Spoiler]

[Spoiler] As part of the Six Paths of Pain, the Human Path is used for a number of different purposes over the years: all six Paths are used to overthrow and kill Hanzou; when Jiraiya infiltrates Amegakure in order to find out more about Akatsuki, the Human Path fights him and ultimately contributes to his death; in the anime, the Human Path assists in the capture of the Six-Tails; it participates during Pain's Assault, and like the other Paths it is defeated by Naruto Uzumaki. [/Spoiler]

(Source: Narutopedia)