Shinobu Mibu

is a chūnin-level shinobi from Konohagakure.

Appearance
Shinobu has spiky brown hair and dark eyes. His outfit is essentially that of the standard Konoha shinobi, with the exception that the clothes under the flak jacket has been modified so that comes up all the way over his head, like a full body suit that can cover his entire face leaving only his eyes exposed. His forehead protector is also attached to the suit.

Invasion of Konoha Arc
He helped Ibiki during the invasion of Konoha try to fight off Orochimaru's snakes. They were saved by Jiraiya.

Twelve Guardian Ninja Arc
In the anime during the second invasion of Konoha he ordered some shinobi to fight, but he was intercepted by Genma Shiranui.

Hidan and Kakuzu Arc
He was later seen in the anime as a squad member of the Nijū Shōtai infiltrating and searching an underground hideout for Akatsuki.

Five Kage Summit Arc
When Kakashi carries Karin to the Intelligence Division for Ibiki to interrogate, he takes a hostile Karin inside.

Trivia

 * "Mibu" is a town in Japan, while "Shinobu" is a variant word for "Shinobi".