Usopp

Usopp (ウソップ) was born in Syrup Village. He is the sniper of the Straw Hat Pirates. When Usopp was first introduced, he was often (comically) labeled as the "Liar" of the Straw Hat Pirates. He is the fourth member of the crew, the third to join, and also the third to rejoin at the end of the Post-Enies Lobby Arc. He is known with a bounty on his head by his alias and alter-ego "Sogeking".

Appearance
For most of the story, Usopp is a tanned, slim teenager with black curly hair and a long nose, which is apparently an allusion to Pinocchio, a wooden boy from a story of the same name who possessed a nose that would stretch after he lied. He usually wears a dark yellow plaid bandanna, a blue and white striped armband on his left arm, special sniper goggles (he also has a pair of clear rectangular goggles that he sometimes wears in situations where he doesn't have his sniper goggles, like when he first met the Straw Hats or when his sniper goggles were stolen by Mr. 2), brown overalls with a white sash and no shirt underneath (although he wore a murky green shirt during the Skypiea Arc). He also carries with him a yellow satchel, which he stores all his tools and gadgets in. Usopp inherited his famous nose from his mother, while the rest of his face closely resembles his father's. During the Straw Hat separation, after landing in the Forest of Gluttony, Usopp grew quite fat.

After the two year timeskip, Usopp, no longer fat, has grown his hair longer. He has also gained more muscle and grown "manlier", being slightly taller and more muscular than before. Usopp now has a new pair of goggles around his neck (his sniper goggles weren't shown) and has some headphones or ear protectors on. He also now has a little goatee along with a new white suncap he wears on his head. He also has a new pair of rolled-up yellow pants with red suspenders, and a pair of boots. His trademark yellow satchel has been replaced with a red one, but he still has his blue and white striped wrist band on his left arm.

Oda claims that Usopp is most represented by the armadillo. Oda has also said that he uses the color yellow to represent Usopp, and that he smells of gunpowder.

source: onepiece.wikia.com