No.
It may seem as though he dies in the part in which the Straw Hats and the Shandorians (pardon me if the spelling is wrong) and fighting Enel (Eneru) but he soon recovers.
So, you see, he doesn't die.
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Usopp has not yet died in the most recent episode of the One Piece anime nor in the most recent issue of the One Piece manga.
He's 15 before the timeskip, and 17 after.
episode 81 in the anime and chapter 134 in the manga.
There are many weak characters in One Piece. The most pathetic villian is probably Hody Jones, and the weakest member of the Strawhat Pirates is probably Tony Tony Chopper (when he's in his normal form)
Zoro appears in chapter 3 - "Enter Zoro: Pirate Hunter".
Tony Tony Chopper is the doctor of the Straw Hat Pirates. He is a reindeer that ate the Hito Hito no Mi and comes from Drum Island, which makes him the only member of the Straw Hat Pirate Crew who was born on the Grand Line. He is the sixth member of the crew and the fifth to join.