AppearanceAs a direct result of his cyborg modifications that he's conducted upon himself as well as years having spent as a ship dismantler, bounty hunter, and street thug in Water 7, Franky is a powerfully built man with a height of at least seven feet, and he is the second tallest member of the Straw Hats. His forearms are relatively enormous while his biceps are particularly small (These attributes greatly resemble that of the cartoon figure Popeye the Sailor). He has brightly-colored blue hair. His usual choice of clothing usually comprises of a speedo, which causes people to call him a pervert, and a shirt. According to Eiichirō Oda, Franky most resembles a bull, he is represented by the color light blue (cyan), and he smells of cola.
PersonalityFranky is strong-willed and free-spirited, with an often blatant disregard for rules. He does whatever he wants whenever he wants, though he usually wants little more than to build powerful ships or protect those he cares about and at times can appear very eccentric compared to most of the crew. Franky often sings a song or plays a guitar to express his feelings while accompanied by him denying he's crying while he is obviously crying. Depending on the situation and the people he is dealing with Franky can be quite an altruist, as he is quick to defend other people and take action if his friends are harmed, he also holds the belief that no matter what a person is like, they should never be prejudiced or exterminated simply because of who they are. This often causes him to befriend and defend the wrongfully feared and persecuted. Because of his unbiased and protective attitude, he is quick in making friends and allies with the most unlikely of individuals, such as street thugs and pirates. He is seen as a 'big brother' figure, and is admired by many for his efforts to protect them, such as Nico Robin and the Franky Family. Monkey D. Luffy and Franky share some personality traits, with the exception of fighting needlessly, and both grew to respect each other during the events of the Enies Lobby arc despite the disputes the two had in the past.
He tends to say the word 'Super', sometimes spelled "SUPA!", while doing his signature pose. Another of his habits is to refer to the 'current week' for exclamation as in "Of course I'm strong, and I've been especially strong this week." or "I've been like this all week."
He has a running gag of being unintentionally linked to "perverted" things due to a combination of his clothes, strange personality and the situations he gets himself into. His lack of fashion sense seems to stem from the fact that his creativity leans towards crafts and mechanics, which would explain his style of clothing which usually consists of nothing more than his trademark speedo, a large golden chain necklace around his neck and a shirt concealing his rather bulky upper body build.
CrewLuffy appears to dislike Franky at first, largely due to Franky's role in the robbery of Usopp during the Water 7 arc which lead to the breakup being more traumatic for Usopp. However, during the Enies Lobby arc he comes to accept Franky as an ally. Franky seems to have developed respect for Luffy as well though, like the other members of the crew, he is sometimes exasperated by Luffy's childish behavior despite the fact that sometimes he's no better. He also has come to some understanding with Usopp after he makes him comes to terms about the state of the Going Merry, something Usopp knew but didn't want to admit until then.
Franky refers to many of the Straw Hats by nicknames even after joining up with them, Luffy as "Straw Hat", Chopper as "Reindeer-Gorilla", and Usopp as "Long Nose", in Thriller Bark, when Zoro and Sanji disappear, Franky calls Zoro, "Swordsman", and Sanji, "Curly Cook", he calls Nami, "Nee-chan" meaning miss or sis, calls Brook, "Skeleton". He calls the crew by nicknames less often in the Saboady Archipelago arc, but he refers to Nami as "Girlie" over her objections. He only seems to call Robin by her full name. On the crew he and Robin have the most mature bond relationship between them, and he sympathizes with Robin's plight. Franky's bonding with Usopp also seem to have gotten better during the near end of the Thriller Bark Arc, where the two helped together to build a freezing mechanism to bind the monstrosity, Oars, in place. Usopp also agreed in helping Franky maintain the Thousand Sunny during the current arc. On the Thousand Sunny, they each have work shops that are side by side. His habit of crying during sad tales however sometimes gets on the nerves of some of the crew members.
FriendsHis relationship with Iceburg is strange at times as the other man has never really understood Franky's often weird antics (even though Franky refers to him as "Baka-berg" or "Ahoberg" at times, "Baka" and "Aho" being the Japanese words for "idiot" or "moron" or something similar). His original goal to build a ship strong enough to kill a Sea King was always shunned by Iceburg who didn't understand why he kept building his weird and potentially dangerous ships. Tom however praised Franky for the often ingenious designs he would come up with. When the Battle Frankys were used to hurt the innocent, Franky denounced them as his creations, which led Tom to teach him the most important lesson about being a shipwright - that you must be proud of what you've created, no matter what. Furthermore, Tom announced that he was proud he had built Gold Roger's ship to further back up that claim.
Iceburg has only recently forgiven Franky for the part his Battle Frankys played in the framing of Tom, yet despite the differences between Iceburg and Franky, the two former apprentices of Tom are the best of friends. Iceburg was relieved to the point of tears to find out Franky was alive after he was hit by the Sea Train and equally Franky was enraged with CP9 after they told him Iceburg was dead.
Franky is well liked amongst the general population of Water 7 despite being a criminal, although he still commands a certain fear and respect (though the fear is generally just the town being afraid of Franky going on a rampage and destroying the town).
EnemiesFranky is an enemy of the World Government, mostly due to his early ownership of the plans of Pluton, but also because he later destroyed them and assisted the Straw Hats in rescuing Robin. Because he has an bounty on his head, he is enemies with the Marines. He particularly holds a grudge against Spandam for framing him, Iceburg and Tom for the attack on the Judicial ship, forcing Tom to forfeit his pardon for building the Oro Jackson to save them which he finally pays back by slamming Spandam's elephant sword onto him.
Franky FamilyAlthough not related to him by blood, the entire Franky Family was set up by himself to look after the failures and rejects of Water 7 like Zambai. The group was very close, calling each other (and those on good terms with them) "sister" or "brother".
OtherFranky is the son of a pirate. His parents are unknown, they seemed to have been unamused by the creations he made in his youth, as they were the very reason he was tossed in the ocean.
Abilities and powersFranky is a human with artificial parts; commonly known as a cyborg. These modifications grant him vast amount of strength, as well as the ability to shoot fire and nails from his mouth, fire bullets from his index fingers, bullets and cannonballs of compressed air from his arms and hands; and making him invulnerable to most attacks from the front. His back however is still wholly flesh and blood and is therefore one of his greatest weaknesses; Franky did the modifications himself, and could not reach his back. Even without modifications, his back is dense enough to endure multiple pistol shots. His years of being a ship dismantler as well as bounty hunting seem to have contributed greatly to his formidable strength; even when running low on cola, he exhibits superhuman strength enough to overwhelm a charging, fully grown elephant - stopping it in its tracks before dragging it around by the trunk like it was a rag doll. Even without his cyborg functions, Franky's fighting abilities are more than enough to allow him to fight even against trained assassins. The fact that he could defeat Fukurou, a member of CP9, on his own is a testament to his prowess. His fighting style appears to revolve around boxing, but he does not hesitate to fight dirty if need be. Additionally, despite having most of his anatomy reinforced with solid steel, Franky has somehow made it possible for his cyborg body to retain its bouyant properties, allowing him to stay afloat on the surface of deep water, which would otherwise be impossible since anything comprised of metal would normally just as easily sink as a devil fruit user in the sea. It would seem that Franky is also an excellent swimmer, even before becoming the cyborg he is now. A fact made apparent by his ability to outswim the sea kings that he frequently tries to slay with his series of battle Frankys during his childhood. Using his Franky Butterfly, he can swim upstream in the waterfalls of Enies Lobby.
Franky's left arm is primarily used as a gun; a multi-barreled machine gun can pop out of his wrist, any of his fingers can fire bullets, and by turning aside his hand, Franky can reveal a cannon in his arm that uses his left hand as a targeting device. Franky's right hand is an iron fist beneath a more normal-looking cover, and the hand has an extendable chain that allows him to make attacks from a distance.
Some common attacks include Strong Right: Franky launches his right fist forward and can reel it back in with a chain, similar to Luffy's Gomu Gomu no Pistol; and Coup de Vent: Franky connects his arms with a T-shaped pipe and sends a powerful blast of concentrated air out that can destroy entire building complexes. Coup de Vent is his most powerful attack which incidentally uses up the most cola. Franky also has the power to turn into a centaur-like form with an extra set of legs strangely extending forward from his pelvis, though he has implied that its use is limited by stating he is "super powerful this week" just before he uses it. Despite his pride in it, it seems to do relatively little for any of his combat abilities, save for using his four legs to trap his enemy's limbs, leaving them completely at the mercy of his attacks.
In Chapter 404 of the One Piece manga, it is revealed that depending on what kind of drink Franky has it can change his hair style and attitude when Chopper accidentally hands him vegetable juice and tea. It also reveals that Franky's strength is many times greater when he has bottles of cola in his stomach fridge, and he needs it as a fuel for some attacks. His hair acts as a kind of meter to the amount of cola in his stomach being tall if he is full and sagging if empty. Franky's stomach compartment can hold up to three bottles, or six liters, of cola.
In addition to his cyborg-enhanced body, Franky is also a first-rate shipwright and carpenter from working under Tom. A genius of his own right, he developed a cannon-like mechanism that accumulates air rapidly within a confined space right before releasing it as a compressed air-based projectile powerful enough to bring down large establishments as well as provide a superb means of propulsion, which served as a template that gave birth to the creation of his Coup De Vent functions. He designed the Thousand Sunny himself featuring several unique functions like the Coup De Burst and Soldier Dock System, and has actually built an entire bridge over a large gap and even put in small details such as carved handrails in an extraordinarily small amount of time (though he wanted an extra thirty seconds since he wasn't satisfied with the finish). He can also somehow build stairs suspended in midair, and while they can support human weight, they do not stand for long. He calls this maneuver "Franky Skywalk", and was used fighting Oars in the Thriller Bark arc.