Aoba Yamashiro

is one of the handful Tokubetsu Jonins of Konoha, who is randomly seen from time to time. He is usually seen with Genma Shiranui and Raido Namishi.

Konoha Invasion arc
He makes his first appearance alongside other Tokubetsu Jonin Shinobis who repels the invading forces during the invasion of Konoha.

Return of Itachi arc
Aoba later appears inadvertently telling Sasuke Uchiha of Itachi Uchiha's visit to Konoha, causing Sasuke to rush from the room in search of his brother. The Jonin clearly disapprove of this, with Might Guy frowning at him and Kurenai Yuhi calling him an idiot. Sasuke did not find out about

Search for Tsunade arc
After Tsunade accepts being the new Hokage, Aoba is given (along with Genma Shiranui) the task to announce the inauguration of the fifth Hokage to the village.

Hidan and Kakuzu arc
Aoba appears in Part II as a member of the Niju Shotai, assisting Asuma Sarutobi's team in the fight against Akatsuki, where he used his abilities to hold of the Akatsuki duo, while Asuma was being carried to safety by his team.

Abilities
He demonstrates a technique involving large numbers of crows to swarm and blind the enemy. The crows seem to be dispelled like shadow clones when struck and are used to disguise Raido Namiashi's movements. While fighting Kakuzu it was also shown that he is adept at taijutsu.

Trivia

 * Many people have thought that Aoba was part of the Uchiha Clan. One reason is that his jutsu have been known for use of the Uchiha Clan. Also his hair is black like most members and the glasses could be to cover his Sharingan. However this could not be true due to the whole Uchiha Clan massacre. Some fans also thought that he was a part of the Aburame clan due to his hair-style and glasses which appear similar to Shino's.