As a member of the Straw Hat Pirates, Franky is a competent crewmate as well as a valuable asset for the crew. Being their official shipwright, Franky is in charge of maintaining the Thousand Sunny's condition, along with the other vehicles, instruments, or weapons that the Straw Hats may employ.
He is also an accomplished surgeon as he was able to perform an operation on himself twice, despite the fact that he does not specialize in the field. He was able to do this even though he was close to death.
Franky has considerable skills in playing a guitar.
Due to the bionic modifications done to his body, Franky has incredible superhuman strength. His years of being a ship dismantler, as well as a bounty hunter prior to piracy seem to further contributed greatly to his formidable physical prowess; even when running low on cola, he exhibits enough strength 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. When first confronted by the CP9 members in Water 7, Franky was shown to be strong enough to almost break through Blueno's Tekkai and quickly overpower him in terms of brute force. Franky was even able to briefly fight on par against Luffy during their initial confrontation, before their fight was interrupted by the Galley-La Company workers. During his fight with Fukurou, Franky easily smashed through his Tekkai causing him to complain in pain, an extraordinary feat as Fukurou is a full-fledged Rokushiki user. Even before he became a cyborg, Franky is strong enough to brutalize Spandam's face with a rifle, disfiguring him with a single hit.
In addition to his strength, Franky also displays considerable skill on whatever item he lays his hands upon, be it in or out of combat (i.e. he was seen effectively wielding, with considerable dexterity, a large pair of makeshift nunchakus against Tararan). Even without his cyborg functions and an arsenal of weaponry, Franky is a highly skilled boxer which he combined with his cybernetically enhanced physical strength to defeat highly skilled and dangerously powerful assassins with very fast and powerful punches. The fact that he could defeat Fukurou, a very powerful Rokushiki master and member of CP9 on his own is a testament to his prowess. He is also a skilled wrestler, able to use suplexes to great effect as shown when he was able to grapple Kyuin, a massive woman larger than himself and throw her with accurate timing to smash her head into Senor Pink, causing damage to both of them in one move. He also copied Senor Pink's signature wrestling technique, the Baby Buster, and developed his own variation which he used to overpower the samurai Suke.
Franky has extreme superhuman durability due to his cybernetic enhancements allowing him to shrug off firearms, artillery, and even a land mine planted by Spandam without any strain. Even when low on cola, Franky is resilient enough to withstand barrage of powerful punches from Fukurou and simultaneously punched Fukurou back in retaliation. He could also survive being smacked down by Oars, a gigantic zombie, with extreme force and also Kuma's Nikyu Nikyu's powerful shockwave directly to his abdomen. While on Karakuri Island, Franky managed to survive the giant explosion that completely destroyed Vegapunk's lab after he accidentally pushed the self-destruct button despite having his skin gruesomely burned off in the process. Even before he became a cyborg, Franky was brutally run down by the Puffing Tom in a failed attempt to save Tom. While on the verge of death, he survived long enough to not only swim and climb aboard an abandoned ship, but also used the ship's wreckage to modify himself into a cyborg. After the time skip, Franky is tough enough to withstand Pink's suplex smashes that damaged his back, the only part that remains unmodified, and also his Baby Buster attack that can cause extreme damage to his cybernetic face. Despite all the damage he suffered, Franky could still exert enough physical power to push back the Sea Stone SMILE Factory to halt the constriction speed of the Birdcage.
He also seem to be born with great hearing, as he could hear the dwarves trying to open the SMILE factory door from a fairly long distance while been back slammed by Senior Pink.
Franky is an extremely capable and strong swimmer, to the point his Franky Butterfly technique allows him to swim up waterfalls. When he was younger, he even taught the sumo-wrestling frog Yokozuna the crawl stroke. Franky even declined Luffy's offer to eat the Mera Mera no Mi as he preferred to retain his ability to swim.
Despite his wild and reckless nature, Franky is very tactical, willing to use deception and trickery to gain an advantage in battle. He has shown a great understanding of psychological warfare. In Enies Lobby, he cleverly deceived Spandam and numerous other Marines into leaving by appearing to self destruct with his Coup De Boo, effectively exploiting their cowardice and fear of death when in reality, he intends to break free from his chains using Coup De Boo, which he succeeds as Spandam and the Marines were busy escaping. When he is unable to keep up with the extreme speed of Fukurou's Soru, he used insults to taunt Fukurou into disregarding Soru, tricking him into direct close quarter combat. Fukurou's anger at his insults allowed Franky to fight the Rokushiki user on equal terms despite Fukurou's speed advantage as a Soru user. When Chopper went on a rampage in his Monster Point, Franky exploited Chopper's weakness as a Devil Fruit user by hurling him into the sea, using the ocean to neutralize Chopper's Zoan transformation while also saving him from the fatal strain of Monster Point. In Dressrossa, while attempting to break into the SMILE Factory, Franky exploited Pink's hard-boiled and compassionate nature by lying to him that there was an old lady in trouble in a far distance, leading Pink to go find the old lady while breaking free of Pink's suplex hold that kept him restrained.
In addition to his cyborg-enhanced body, Franky is also a master craftsman, being a first-rate shipwright and an exceptional carpenter from working under Tom. As both a former employee of Tom's Workers and one of Tom's apprentices, Franky's skills as a shipwright are top-notch and well versed. This was evident in his youth, when he helped in the construction of the first Sea Train, the Puffing Tom alongside Tom, showing that his skills as a shipwright extended to naval architecture as well. He helped to achieve this feat, while in his spare time also continuing to build his own line of thirty-five specially designed, numbered battleships named the "Battle Frankies", with each ship capable of killing a sea king. Even his years of dismantling had not affected his carpentry skills in any way. The best proof of this was when he was able to finish the construction of the Thousand Sunny, with the aid of Iceburg, Yokozuna, and the remaining Galley-La foremen, under a short period of time. His brillant scientific intellect also allowed him the ability to self-taught and grasp the concept of the blueprints and technology of the genius inventor and scientist Vegapunk, which were left behind in one of his labs on Karakuri Island, and thought to be impossible to create, complete, and even understand. After his two years of training on that island, Franky successfully proved his ability to not only understand his technology, but also recreate it. The greatest example of this feat is Franky's addition of the light lasers to his arsenal, which was a form of technology that only Vegapunk himself was originally able to create. Franky was also able to realize Vegapunk's concept of a transforming robot with the use of the recently discovered alloy Wapometal. Franky's engineering skills even extend to gadgetry as well, as he had helped Usopp with upgrading Nami's newest Clima-Tact.
Having once held onto the blueprints for Pluton before incinerating them, Franky was the only person with the potential of recreating the fearsome Ancient Weapon of mass destruction before the knowledge was lost forever.
A scientific 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 the Soldier Dock System.
He 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 was not 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. Furthermore, he quickly sealed Caribou in a barrel and made it so that even with his Devil Fruit powers he could not escape.
Franky's unrivaled talent in carpentry allows him to quickly learn and master new styles of architecture. When he goes undercover in Wano Country as a carpenter, his workmanship was praised by his superior, who refers it as perfect. It was stated that Franky works ten times more efficiently than his co-workers.
Franky was able to lead a group of Wano carpenters to fully restore the broken ships in preparation for the raid on Onigashima. With Usopp's aid, Franky also restored the Thousand Sunny, which was badly damaged by Big Mom and later the Beasts Pirates, into perfect condition in a single night.
Franky is a human with artificial parts commonly known as a cyborg. His front is heavily armored and insensitive to most attacks, while his back, where he could not reach, remained vulnerable. His body is equipped with a wide variety of weapons, including rockets, an extendable right arm, the ability to breathe powerful flames as well as being able to release powerful blasts of air from multiple parts of his body. His stomach contains a refrigerator compartment that can hold up to three bottles of cola to fuel him and his attacks. His personality is also affected by the type of beverage that is stored in his refrigerator compartment. He can use up large amounts of cola in an instant to launch powerful bursts of air from his arms, utilizing these blasts for techniques such as the devastating "Coup de Vent".
These modifications grant him a vast amount of strength, so much in fact that he was able to successfully overpower CP9 Members Nero and Fukurou. His back, however, was still wholly flesh and blood and was, therefore, one of his greatest weaknesses, since Franky did the modifications himself, and could not reach his back. Even without modifications, his back is dense enough to endure multiple pistol shots or a Rankyaku from an experienced Rokushiki user.
Additionally, despite having most of his anatomy reinforced with solid steel, Franky's cyborg body is buoyant enough to allow him to stay afloat on the surface of deep water. It would seem that Franky is also an excellent swimmer, and was so even before becoming a cyborg, a fact made apparent by his ability to swim faster than the sea kings that he frequently tried to slay with his series of Battle Franky's during his childhood. Using his "Franky Butterfly", he even managed to swim up 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 a 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. The 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. 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.
It was shown during Franky's fight with Fukurou 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 shows that Franky's strength is many times greater when he has more bottles of cola in his stomach fridge, and he needs it as a fuel for certain 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.
After two years, Franky has incredibly modified his body and became much larger and physically more powerful and optimal in appearance and function, respectively. The state of the art technology designed by Dr. Vegapunk, with nearly all of the futuristic and technological aspects of the Marines and the world as a whole (i.e. the Pacifista project and the assimilation of Devil Fruits into weapons) have been incorporated into Franky's upgraded bionic modification.
It is also worth noting that Franky's original transformation into BF-36 was initiated as a quasi-surgical operation of necessity to save his life, and it is assumed was accomplished with some modicum of haste from a medical standpoint, since he suffered from massive external and internal injuries; whereas the process to become BF-37 was a two year long-planned process done with highly advanced machinery in an abandoned fully-stocked, scientific laboratory, on his preexisting cyborg body, so Franky's own experience being one beforehand was likely factored in when customizing its schematics and functions, as well as understanding whatever notes and information of scientific research that Vegapunk left behind.
Franky even went the extra mile with his modifications, adding utility functions like his "Franky Nipple Lights", and nonsense functions like his pop-out hair feature. With all this in mind, post-time skip Franky is truly a force to be reckoned with. The scientific weapons that Franky has displayed so far in the post-time skip are noticeably more offensive and destructive than his BF-36 weapons. So far, he has revealed explosive missiles housed in his large shoulders, and a modified "Coup de Vent" known as "Franky Radical Beam", that fires a powerful explosive laser beam instead of air, along with other powerful weaponry. He also features more advanced and powerful variations of the BF-36 artillery such as an improved flamethrower installed in his body that allowed him to breathe out large fireballs and the machine guns installed in his new cybernetic hand to rapid-fire bullets in long-range combat. The fact that he was able to have laser beams in his arsenal despite the fact it was said that only Vegapunk was able to create them further proves Franky's engineering mastery. His engineering skills also extend to anatomy as he modified himself into a cyborg and was able to perfectly understand Vegapunk's notes on animal modification and his Pacifista project.
He is still fueled by cola, and now has enough capacity to endure a prolonged fight with Senor Pink, Dellinger, Machvise, and the Marines led by Bastille that were stationed at Dressrosa, before needing to fall back on his reserve cola. As with his previous body, Franky could not reach his back, and there it is left unmodified.
General Franky is a giant robot, with a height of 13m. It is modeled after its name, a shogun, and is a one-person weapon/vehicle, Franky himself is able to pilot it inside a control room in the chest and can operate it from there. It is equipped with a giant marauder's sword named "Franken". However, because he is rather inept at using a sword, the attacks he uses are seemingly ineffective, and it sometimes appears most of its projectile armaments are purely from Franky himself. Franky can also use the giant fists to deliver powerful punches and can also slam its heavy body on his enemies to crush them.
At first the shogun seemed mostly useless as many of its attacks came from Franky himself, however, it was not until his battle against Baby 5 and Buffalo that its strength was truly shown. It has been shown to possess both powerful weaponry and be extremely tough and resilient to damage, for it was able to take a point-blank missile attack from Baby 5 that only managed to knock it over without doing any damage. His robot is also capable of launching an attack similar to both his Coup de Vent and Franky Radical Beam known as his "General Cannon", which fires a large blast of compressed air at his opponent(s). Franky compares the power of this attack to Thousand Sunny's "Gaon Cannon". The robot can also provide protection against any outside agents, as Franky used it to stand in the middle of a huge cloud of Caesar Clown's H2S gas completely unaffected.
Though not at the same level as Usopp, Franky is an expert marksman, having great accuracy in using all the long range artillery he had built and installed into his body. On Fish-Man Island, Franky easily blasted down multiple fish-men with the cannons in his shoulders. At Dressrossa, he shot down numerous members of the Donquixote Pirates while attempting to break into the Toy House.
Though Franky is seldom seen carrying weapons (owing to the fact that he stores several within his body), he has been shown to wield tools and implements from time to time, most notably his carpentry tools, though at other times, he is seen carrying conventional weapons that he seems to be able to wield proficiently. Such weapons include custom-built nunchucks and hand-held cannons.