Usopp is the sniper in the gang of pirates lead by Monkey D Luffy. Though he is often mistaken as cowardly or meek, he is anything but that. On multiple occasions he rises to the challenge and meets his enemies face to face, saving the gang from difficult situations.
This second-generation pirate joined Luffy after he was recruited from his home island. He may lack in brute strength as compared to the other members of Thousand Sunny, but make no mistake, Usopp could defeat most enemies in One Piece without them even knowing that they are within his range.