Shinobu Mibu

is a chūnin-level shinobi from Konohagakure.

Background
In the anime, Shinobu was part of the Ibiki Morino's team that went to intercept Kirigakure's Cypher Division. They were met with resistance and a battle ensued.

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.

Abilities
By the time Konoha faced Kirigakure's Cypher Division, he was seen carrying a sword, which means he is skilled in kenjutsu.

Invasion of Konoha Arc
During the Chūnin Exams, he guarded one of the entrances of the village alongside Ibiki Morino. He questioned Ibiki about the type of person Orochimaru was and why he became a missing-nin. He listened in shock as Ibiki told him that as a child he never felt like Orochimaru was human but merely something assuming a human form. Later when the village is attacked he attempts to fight off Orochimaru's snakes but their efforts did little to no good. They were saved by Jiraiya who summoned Gamahiro on top of the snakes killing one of them.

Twelve Guardian Ninja Arc
During the second invasion of Konoha, he told some shinobi to fight and protect the village, but he was intercepted by Genma Shiranui who came with different orders from the Hokage.

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. He returned from the infiltration and reported that he hadn't found anyone or seen anything down there.

Five Kage Summit Arc
In the anime, when Kakashi carries Karin to the Konohagakure Intelligence Division for Ibiki to interrogate, Ibiki motions to him and he takes a hostile Karin inside.

Naruto 5: Blood Prison
During Naruto's flashback to the members of the village when he was gathering natural energy to enter Sage Mode, Shinobu can been seen amongst the villagers.

Trivia

 * "Mibu" is a town in Japan, while "Shinobu" means "to endure," or "to conceal oneself" and is a variant word for "shinobi".