Raidō Namiashi

serves as the Third Hokage's assistant during the Chunin Exams, and is characterized by a large scar on his left cheek. He is usually seen with Genma Shiranui and Aoba Yamashiro.

Part I
During the final rounds of the Chunin Exams stays in the box seat with the Third Hokage. He keeps the Third informed about what is going on and communicates the Third's wishes to the other ninja involved with the exams. When the invasion of Konoha begins, Raido is attacked by the Sound Four, disguised as the Fourth Kazekage's Bodyguards, to keep him from helping the Third Hokage.

Sasuke retrieval arc
Raido is sent on a mission with Genma Shiranui, Iwashi Tatami, and Shizune. During a break on they way back, Raido and Genma encounter the Sound Four. In order to beat Raido the Sound Four must first activate level two of their cursed seals, leaving Raido gravely injured and in need of medical attention by Shizune.

Hidan and Kakuzu arc
Raido appears in Part II as a member of the Niju Shotai, assisting Asuma Sarutobi's team in the fight against Akatsuki. After Hidan and Kakuzu are distracted by Aoba's crows, Raido, dressed in black, attempts a sneak attack on Kakuzu with a black sword. Kakuzu is able to defend against it, but by doing so Raido learns some valuable information about Kakuzu's abilities.

Abilities
Despite the handful of fights he has been in, Raido has yet to be seen in extended combat. Given that the Sound Four needed to activate their cursed seals in order to defeat him, it is likely that he is a formidable fighter. It was shown that when Hidan and Kakuzu attempted to kill Kotetsu and Izumo, Raido successfully, attacked and fended off Kakuzu with a Sword called Ebony Blade.

Trivia

 * "Namiashi" means "walking pace" while "Raido" means "following blindly."