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Usopp is one of the more sentimental Straw Hat Pirates, and cries or loses his temper in moments of emotional stress. At the start of the series, Usopp was an easily frightened, anxious, insecure, compulsive liar. Unlike Nami , Usopp's cowardice is the result of his fear and insecurity, especially when faced with uncertainty. Though Usopp is a coward by nature, he is able to put aside his fear during more desperate times: despite being afraid, he faces those fears for the sake of his friends and sometimes people he barely knows.

Source from Wikipeida