Here's why:
A Strawhats Criterium:
1. Running Gags, very obscure and yet somehow fits in
Luffy: Meat, complete idiocy
Zoro: Drinking and sleeping, green hair
Sanji: Ridiculous perversion and flattery
Franky: Gimmicks such as his dances and nipple lights, goofy character in general
Robin: Somewhat sadistic and masochistic remarks although normal most of the time
Brook: Dead, perversion (although not on par with Sanji)
Chopper: A Human-esque Reindeer that never fitted in, cotton candy, extremely fearful pirate
Nami: Obsession with money and riches, fearful pirate
Usopp: A fearful pirate, always lying and exaggerating stories
2. They would normally despise pirates (except for Luffy and Brook of course)
Zoro: Pirate Hunter
Sanji: Past encounter -> Shipwreck scarred childhood etc.
Franky: Didn't hate them... just didn't like them either
Robin: Didn't trust Pirates although she worked alonside them
Chopper: Blackbeard Pirates, although he admired what Hiriluk said about Pirates
Nami: Arlong Pirates sovereignty over Cocoyashi
Usopp: Black Cat Pirates, because of their scheming etc.
3. Initial rejection of Luffy's offer, they find a mutual enemy in an arc
Zoro: Pirate Hunter, Morgan
Sanji: Loyal to the Baratie, Krieg
Franky: Loyal to his "Family", CP9
Robin: Never offered as they were enemies, Crocodile
Brook: Couldn't join because he lacked his shadow, Moriah
Chopper: Felt he couldn't join as a "monster", Wapol
Nami: Had her deal with Arlong, Arlong
Usopp: Kaya etc, Klahadore
4. Based on or inspired by people or other fiction
This is either related to their design, traits or backstory
Luffy: Eiichiro Oda's childhood Persona
Zoro: Francois L'Ollonais and El Zorro
Sanji: Steve Buschemi and Romeo
Franky: Popeye the Sailorman
Robin: Cinderella
Brook: Dead Man from an Elegy written by Wordsworth
Chopper: Rudolph the Red Nosed Reindeer
Nami: Cat Woman
Usopp: The Boy Who Cried Wolf and Aesopp
5. Based on a nationality stereotype (of sourts):
Luffy: Brazilian
Zoro: Japanese
Sanji: French
Franky: American
Robin: Russian
Brook: Austrian
Chopper: Canadian
Nami: Swedish
Usopp: African
Odas Numbers:
Swordsman Trio:
Zoro wields three swords
Brook wields one sword
There is a gap, a lack of a dual wielder:
Kin'emon
Zoro's swords are neutral
Brook uses ice
Kin'emon uses fire
He just... fits, ya know? And it appears he's had a tough past because of his apparent relation with Kaido; it's possible he and Momonosuke had been exiled and Kin'emon is simply a body guard and not Momonosuke's real father, and even if they are blood relatives then surely the Strawhats will need a Cabin Boy? Much alike the Roger Pirates with Buggy and Shanks.
Momo even draws Parallels with Buggy -> unintentionally eating a seemingly weak Devil Fruit
A Strawhats Criterium:
1. Running Gags, very obscure and yet somehow fits in
Luffy: Meat, complete idiocy
Zoro: Drinking and sleeping, green hair
Sanji: Ridiculous perversion and flattery
Franky: Gimmicks such as his dances and nipple lights, goofy character in general
Robin: Somewhat sadistic and masochistic remarks although normal most of the time
Brook: Dead, perversion (although not on par with Sanji)
Chopper: A Human-esque Reindeer that never fitted in, cotton candy, extremely fearful pirate
Nami: Obsession with money and riches, fearful pirate
Usopp: A fearful pirate, always lying and exaggerating stories
Kin'emon: Flatulist from a "closed door country", stuck in his old ways because of this, he's also a massive pervert
2. They would normally despise pirates (except for Luffy and Brook of course)
Zoro: Pirate Hunter
Sanji: Past encounter -> Shipwreck scarred childhood etc.
Franky: Didn't hate them... just didn't like them either
Robin: Didn't trust Pirates although she worked alonside them
Chopper: Blackbeard Pirates, although he admired what Hiriluk said about Pirates
Nami: Arlong Pirates sovereignty over Cocoyashi
Usopp: Black Cat Pirates, because of their scheming etc.
Kin'emon: As a Samurai, for it is honorable
3. Initial rejection of Luffy's offer, they find a mutual enemy in an arc
Zoro: Pirate Hunter, Morgan
Sanji: Loyal to the Baratie, Krieg
Franky: Loyal to his "Family", CP9
Robin: Never offered as they were enemies, Crocodile
Brook: Couldn't join because he lacked his shadow, Moriah
Chopper: Felt he couldn't join as a "monster", Wapol
Nami: Had her deal with Arlong, Arlong
Usopp: Kaya etc, Klahadore
Kin'emon: Despised Pirates (Luffy offered his legs to join the crew), Caesar - Doflamingo
4. Based on or inspired by people or other fiction
This is either related to their design, traits or backstory
Luffy: Eiichiro Oda's childhood Persona
Zoro: Francois L'Ollonais and El Zorro
Sanji: Steve Buschemi and Romeo
Franky: Popeye the Sailorman
Robin: Cinderella
Brook: Dead Man from an Elegy written by Wordsworth
Chopper: Rudolph the Red Nosed Reindeer
Nami: Cat Woman
Usopp: The Boy Who Cried Wolf and Aesopp
Kin'emon: Nakamura Kinnosuke
5. Based on a nationality stereotype (of sourts):
Luffy: Brazilian
Zoro: Japanese
Sanji: French
Franky: American
Robin: Russian
Brook: Austrian
Chopper: Canadian
Nami: Swedish
Usopp: African
Kin'emon: Hokkaido; the birth place of Samurai and considered a seperate nation from Japan until the 1850's, Since Kin'emon is almost stuck in the past as citizen of Wanokuni - it fits
Odas Numbers:
That would be Kin'emon...Chopper = 1 & 10 Hi=1, To=10, he ate the Hito Hito no mi
Luffy = 5 & 6 Go=5, Mu=6, he ate the Gomu Gomu no mi
Robin = 8 & 7 Ha=8, Na=7, She ate the Hana Hana no Mi
Brook = 4 & 3 4=Yo, 3=Mi, He ate the Yomi Yomi no Mi
So what numbers are left? 2 and 9. What obvious Japanese word is formed from those two combined? Fuku, the Japanese word for clothing. Who do we know who ate the Fuku Fuku no Mi?
Swordsman Trio:
Zoro wields three swords
Brook wields one sword
There is a gap, a lack of a dual wielder:
Kin'emon
Zoro's swords are neutral
Brook uses ice
Kin'emon uses fire
He just... fits, ya know? And it appears he's had a tough past because of his apparent relation with Kaido; it's possible he and Momonosuke had been exiled and Kin'emon is simply a body guard and not Momonosuke's real father, and even if they are blood relatives then surely the Strawhats will need a Cabin Boy? Much alike the Roger Pirates with Buggy and Shanks.
Momo even draws Parallels with Buggy -> unintentionally eating a seemingly weak Devil Fruit
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