Dokan

Dokan (ドカン, Dokan) is a genin of Konohagakure. He was an academy student during the time Itachi Uchiha attended his first year at the academy.

History
One day, Dokan accidentally bumped into Saisu Kamano and his two friends. Angered by the behaviour of the three freshmen, he quickly snapped and attacked them. When they hid behind Itachi, Dokan asked him if he was their friend, to which Itachi simply raised his hand to challenge him to a duel. However, the furious Dokan ignored his official challenge and attacked him unceremoniously, just to be quickly defeated by the child genius.

Enraged by this humiliation, he gathered a large group of friends and attacked the outgunned group of Itachi, Saisu and their friends. During the ensuing brawl, Dokan tried to attack Itachi who evaded all attacks without fighting back. When Itachi finally got pinned down however, Dokan landed a firm hit. Everybody present was shocked to see Itachi dissolving afterwards, revealing that it was a Shadow Clone they were dealing with all along. Some time later, Dokan and his friends were promoted to be genin and watched Itachi disapprovingly, who, despite being much younger, graduated alongside them.