Genma Shiranui

becomes the proctor during final rounds of the Chunin Exams after the death of Hayate Gekko. He usually has a senbon in his mouth.

Part I
After Hayate's death, Genma referees the final round matches of the Chunin Exams. He battles Baki during Orochimaru's attempted invasion of Konoha. However, their fight is interrupted when Orochimaru calls off the invasion. Later, in the anime, he and Aoba are assigned to announce Tsunade's inauguration as the Fifth Hokage. In the Sasuke Retrieval arc, Genma is returning to the village from a mission with Raido Namiashi, Iwashi Tatami and Shizune, when he and Raidou encounter the Sound Four. In order to defeat Raidou and Genma, the Sound Four activate level two of their cursed seals, leaving Genma gravely injured and in serious need of medical attention. In addition to this, Genma and Raido barely had any chakra left.

Part II
Although he doesn't appear in Part II in the manga until late in the series, Genma makes an earlier Part II debut during the anime's Fire Temple arc. He leads Konoha's ninja in the fight against the zombies that Kazuma had resurrected. Later, after Pain's invasion, he is seen along with Izumo and Kotetsu voicing that while the Akatsuki destroyed all what their forefathers left them, the village wasn't all that left them.

Abilities
Despite the handful of fights he has been in, Genma has yet to be seen in combat. He can spit the senbon from his mouth as a projectile, although its usefulness is unclear. 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.

Trivia

 * Genma said during the Chunin Exams that Naruto has a 'mean left hook'. But during that time, Naruto did an uppercut, not a left hook.