The world of One Piece is wonderful and fanciful on the outside, with dark and mysterious undertones lurking beneath the surface. The cheery but righteous Straw Hat crew are a breath of fresh air in a world that's become used to injustice, and they can bring a smile to anyone's face.
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With that said, there's a lot of questions about the Straw Hats' appearances due to Eiichiro Oda's drawing style and lack of specific details within the story about a character's age. It's almost impossible to tell how tall some characters actually are due to the wild body proportions of One Piece characters, but the data is all there somewhere.
10 Luffy
Monkey D. Luffy is born on May 5, which is Children's Day in Japan. Children's Day takes place during Golden Week, where children get a short vacation from school and are celebrated for their personalities and happiness. It reflects Luffy's personality perfectly since he's the most happy-go-lucky guy in all of One Piece.
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Luffy is 174cm tall, which rounds to about 5 feet and 9 inches. Currently in One Piece, he is 19 years old, and was 17 before the time skip.
9 Zoro
Roronoa Zoro is the stoic right-hand man of Luffy who always does what's best for the longevity of the Straw Hat Pirates, while looking for his next great battle. Zoro has a level head compared to Luffy and is capable of making more stable decisions, which could be a product of his age. He's two years older than his captain at 21 years old after the time skip. Zoro also stands a good amount taller than Luffy at 181cm or 5 feet and 11 inches. Zoro's birthday is November 11, another birthday where the month and day are the same number, like Luffy.
8 Nami
Nami is the Straw Hat's navigator and treasurer of the Straw Hats who has a bunch of other skills and small roles as well. Just like most of the women in One Piece, she stands pretty tall at 170cm, or 5'7". Her thin figure and long legs make her look taller than she actually is, but compared to her male counterparts, she's pretty average in height. She's also older than Luffy, at 20 years old after the time skip.
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Nami's birthday is July 3rd, making her a cancer. Cancers are generally thought to be well versed in emotion, and Nami is possibly the most compassionate Straw Hat given the right circumstances. She can certainly be greedy and cut-throat, but when it comes to protecting the weak, she's the first to put her life on the line.
7 Usopp
Usopp is the same age as Luffy and is 19 after the time skip. He's also pretty much the same height but grows a bit taller than Luffy after their 2 year hiatus. When they reunite, Usopp stands at 176cm, and he gained a lot of muscle in that time away so his appearance is totally different.
Usopp's birthday is April 1st, otherwise known as April Fool's Day. This is extremely fitting considering his tendency to prank others and spin tall tales. Usopp's imagination is his strongest weapon after his sniping skills and the Straw Hat Pirates definitely make use of it.
6 Sanji
Just by looking Sanji's age is probably the hardest to guess out of all the Straw Hat Pirates (the human ones at least). He goes for a more mature look in style and attitude making him appear older than he actually is. In the anime, Sanji is 21 years old after the time skip and his birthday is March 2nd.
Sanji stands at 180cm, making him one of the taller Straw Hats. This would explain why his kicks are so strong since his legs actually are as long as they look.
5 Tony Tony Chopper
Chopper is another character who most fans probably couldn't guess his age if they tried. Chopper is actually the youngest Straw Hat after the time skip and is only 17 years old. His birthday is December 24th, Christmas Eve which reflects the cold climate he comes from and the fact that he was originally a reindeer.
Chopper is only 90cm tall, which is about 2 feet and 11 inches. His small size and gentle appearance are an invitation for enemies to underestimate him, but he's a fierce fighter when he has to be.
4 Nico Robin
Nico Robin is the cool and collected Straw Hat with a love for "cute things". Her personality is hard to pin down until the later parts of One Piece, but she's a fan favorite for sure. She stands at 188cm, much taller than any Straw Hat who came before her, and she's also much older at 30 years old after the time skip.
Robin's birthday is February 6th, which makes her an Aquarius which are known for their honesty and imagination. This trait is best demonstrated when she sees something cute and can't help but get starry eyes and exclaim how cute something is.
3 Franky
Franky is a giant. It's clear in the series but his height and scale seem to change for comedic and dramatic effect, making it difficult to tell how tall he really is. Franky's actual height is 240cm after the time skip, putting him up there with NBA players.
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His birthday is March 9th and his age is 34, even older than Nico Robin. He was an adult with an entire career and "crew" of his own before the Straw Hats so it makes sense that he's much older than them after they meet and join forces.
2 Brook
Brook is ACTUALLY a giant. He appears tall, lanky, and fragile since he's all bones but it's difficult to tell what his real height is. Oda has officially listed Brook's height as 277cm, which is over 9 feet tall. If that weren't enough to cement him as the oddest Straw Hat, he's also at least 90 years old after the time skip. He died at 38 and his body has been preserved since. His birthday is April 3rd, which makes him an Aries.
1 Jinbe
Jinbe is the newest addition to the Straw Hat pirates who lived during the Golden Age of pirates and led the Sun Pirates, basically as the king of the Fishman underworld. Because of this, he's older than the other Straw Hats at 46 years old. Jinbe's height is shown to change throughout the manga and anime for scale because if his true height was shown, he might not always fit on the screen. Jinbe stands at 301cm tall, almost 10 feet. He's a giant fishman with the build of a blue whale and a shark. His monstrous size hides his compassionate and gentle side. His birthday is April 2nd, which makes him an Aries, who're known for their ambition.