Shinobu is a kunoichi from Wano Country and a retainer of the Kozuki Family, having once served in the Oniwabanshu of the Kozuki Shogunate and trained under Kin'emon as his protégée. She is also the younger sister of Shinosuke.
Despite her stout silhouette, Shinobu is quite tall, standing at 180 cm. As a middle-aged woman, she is considered rather ugly with her broad eyebrows, fat nose, and overall chubby face. She has brown hair tied in pigtails and wears over-the-top makeup, as well as a pink-colored kunoichi attire.
She was very beautiful when she was younger, able to capture the hearts of many of her foes according to Hanzo. 20 years ago, she wore a hot-pink, short dress with slits at the sides with a plunging neckline, revealing her cleavage. Her pigtails were much more longer and she wore a light-yellow scarf.
She also seems to panic easily and said that she is afraid of sharp objects. However, she apparently did not have a fear of sharp objects twenty years ago as she did carry a sword and used throwing kunais.
She is extremely serious when it comes to overthrowing Orochi as she became frustrated when Kin'emon's plans began falling apart. When suspecting that the captured Heart Pirates were responsible for leaking the plans, she went as far as to say that the captured should be silenced.
She is sympathetic towards the suffering of Wano citizens who were cruelly oppressed by Orochi, being driven to tears when she recalled how the impoverished people of Ebisu Town were driven by uncontrollable hunger to eat the faulty SMILE fruits given to them by Orochi.
Shinobu is very loyal to the Kozuki Family and she supports Kin'emon's efforts to overthrow Orochi. She fought alongside Oden and his allies before they were captured. Shinobu was spared from death, due to Oden claiming not to know her. The main reason she ceased being Fukurokuju's subordinate was because he betrayed Oden. When the citizens of Wano were insulting Oden during his execution, Shinobu was quick to tell them the truth about the reason for Oden's behavior.
Straw Hat Pirates
Shinobu trusts the Straw Hats and she works well with them on multiple occasions. She and Nami even went on a mission together.
Trafalgar D. Water Law
When Law's crewmates were captured by Orochi's forces, Shinobu became angry from the plan being ruined and suspected Law's crewmates leaking the information. When Shinobu suggested to silence and kill his comrades to prevent an information leak, Law became angry at her and decided to rescue his crewmates himself to prevent Shinobu from killing them and told her that he would not forgive her for doubting his comrades. When Law had not shown up prior to beginning the raid on Onigashima, Shinobu did not care whether he joined the fight or not. Their relationship between each other is strained due to Shinobu's extremist thinking for killing Orochi and would use any means necessary to make sure the plan to kill him succeeds, even if it means silencing allies to prevent an information leak. Due to this, they have a strained relationship.
Because of his tyranny, Shinobu developed immense resentment and hatred for Orochi and she tirelessly supports the Kozuki Family in their efforts to overthrow him. Her disgust for him increased when seeing him execute Shimotsuki Yasuie and his delight in the citizens of Wano being under the effects of SMILE.
Formerly, Shinobu deeply respected Kanjuro as one of Oden's closest retainers, respectfully referring to him as Kan-sama. However, Kanjuro was secretly working as a spy for Orochi and jeopardizing the Kozuki revolution that Shinobu had anticipated for twenty years. Because of her trust in Kanjuro, she never considered the possibility of him being a traitor. Shinobu eventually learned of Kanjuro's true colors after he dropped the charade.
Abilities and Powers
Shinobu is a veteran kunoichi with a high degree of knowledge about stealth, espionage and escape techniques. She possesses excellent reflexes (something that allowed her to save her allies of the Ninja-Pirate-Mink-Samurai Alliance from a direct attack from Kaidou) and is agile enough to run on walls.
- Further information: Ninjutsu
As a veteran kunoichi, Shinobu is highly skilled in ninjutsu, stealth, and infiltration techniques. She easily defeated Hanzo of the Orochi Oniwabanshu and also snuck into Orochi's castle.
Shinobu has shown great skill in shurikenjutsu, being able to make an object ricochet off the ground to strike at Hanzo's groin. During her youth, she showed remarkable marksmanship with kunai throwing knives, taking out a Beasts Pirate sniper aiming at Oden.
- Further information: Juku Juku no Mi
Shinobu ate the Juku Juku no Mi, a Paramecia-type Devil Fruit that gives her the ability to make anything she touches rapidly mature and rot. As the residents of Wano are unaware of the existence of Devil Fruits, she calls her power "Juku Juku Enticement Jutsu".
She can use this power to avoid attacks by rotting away a place for her to hide, such as by rotting away the ground to create a sinkhole. She can also decay away anything that might be obstructing her path.
She can also use this power to physically age living beings, though they do not mature mentally. By aging a young ally into adulthood, they become bigger and stronger, and thus more helpful in battle. This action cannot be reversed.
Shinobu served under the Kozuki Family's ninja squad known as the Kozuki Oniwabanshu, but when Kurozumi Orochi usurped the shogunate 28 years ago, all of the ninja except Shinobu eventually decided to serve him as the Orochi Oniwabanshu.
25 years before the present, Shinobu spied on the confrontation between Kozuki Oden and Orochi as Oden unsuccessfully attempted to take down his usurper. The kunoichi witnessed as Oden made a deal with Orochi to dance naked in the street every week to prevent the shogun from sending 100 kidnapped citizens to his ally Kaidou, with the impression that Orochi and Kaidou would build ships to eventually leave Wano Country.
Five years later, Oden and his Nine Red Scabbards battled Kaidou and the Beasts Pirates in Udon, and Shinobu joined the battle as their ally. The Beasts Pirates eventually emerged victorious, and Oden claimed to not know Shinobu to allow her to go free.
Oden and the Scabbards were sentenced to execution by boiling, and Oden lifted his retainers on a piece of wood while standing in the boiling oil. As the citizens commented derisively about Oden, Shinobu attacked one of them and told them about the deal Oden had made with Orochi. Fukurokuju and the Orochi Oniwabanshu then confronted her, and as Orochi decided to have Oden and his servants shot to death instead, Oden threw his retainers away from the execution site. Shinobu then broke free from Fukurokuju and ran away with them as Oden was executed. Shinobu gave the Scabbards their weapons as they were chased by an army of pursuers.
For the next 20 years, the Kozuki Family and all its allies were persecuted by Orochi and Kaidou. However, when Oden's son Kozuki Momonosuke and a contingent of the Scabbards led by Kin'emon returned to Wano after being sent forward in time, Shinobu joined their effort to recruit allies for a raid on Onigashima during the Fire Festival to take down Kaidou and Orochi.
Wano Country Arc
Kin'emon summoned Shinobu to the ruins of Oden Castle to train their ally, Nami of the Straw Hat Pirates, to become a kunoichi. Kaidou then came to Kuri to look for Monkey D. Luffy and Trafalgar Law and obliterated the alliance's hideout with a blast of fire breath, but Shinobu saved herself and her comrades by using her Devil Fruit ability to sink them into the ground.
Shinobu took Nami to the Flower Capital and guided her in spying on two officials discussing a governmental weapons purchase. However, the two men spotted Nami peeking from the attic and pierced through the floor with a blade, making Shinobu scream in fear. Shinobu then brought out a big kite and glided outside with Nami. They then infiltrated Orochi Castle in order to protect Nico Robin while she looked for information. When Robin was caught by the Orochi Oniwabanshu, she contacted Shinobu and Nami and they went to find her. As Robin and Brook fought the Oniwabanshu in Orochi's banquet hall, Oniwabanshu member Hanzo crawled into the attic above and found Shinobu and Nami. Shinobu became enraged when Hanzo recognized her but then second-guessed himself, causing her to strike him in the groin. Shinobu then broke through the floor into the chaotic banquet hall, crashing down onto one of Orochi's heads, and she was shocked as she saw the yakuza boss Kyoshiro cut down the oiran Komurasaki for defying Orochi. As Orochi was chasing Robin, Nami struck him with a thunderbolt.
Shinobu, Nami, Robin, and Brook managed to escape from Orochi Castle and go to the Northern Cemetery in Ringo with Kanjuro. Robin and Brook shared the information that they had found, and Nami, Robin, and Shinobu decided to return to the Flower Capital to go to a bathhouse. When they got to the bathhouse, they talked about Kyoshiro, and Shinobu told the two Straw Hats about Wano's former yakuza boss Hyogoro. However, X Drake and Basil Hawkins then led a platoon of Beasts Pirates into the bathhouse to capture anyone with the crescent moon symbol on their ankle, which the Wano administration had discovered was a symbol of loyalty to the Kozuki Family. Nami tried to hide behind Shinobu, and when Hawkins tried to get her out in the open he accidentally disrobed her, causing Sanji (who was invisible because of his Raid Suit) to reveal his presence with a nosebleed. Sanji then flew Shinobu, Nami, and Robin out of the bathhouse, and as they moved through the air he revealed that Law's crewmates had been captured.
Sanji took the three women to Ebisu Town, where Shinobu confronted Law, believing that his crewmates had given away the Kozuki Family's secret call to arms. Despite Law being enraged by the accusation, Shinobu insisted they eliminate his imprisoned comrades instead of rescuing them; however, Kanjuro told her to stop antagonizing their allies. A man named Tonoyasu then came in with the call to arms message and offered his help in the final battle; he referred to Shinobu and Kanjuro with familiarity, but they could not figure out who he was. The next day, the alliance members found out that Tonoyasu had been captured, and as they watched a broadcast of his impending execution, Shinobu and Kanjuro realized that he was the former daimyo Yasuie.
They raced into the Flower Capital to save him, but he was executed before they could reach him. They watched as the Ebisu Town citizens laughed in response to his death, and Shinobu revealed that Orochi had put defective SMILEs in the townspeople's food supply to force them to smile and laugh at all times. The Straw Hats then started fighting Orochi's forces to retrieve Yasuie's body, and after the fighting dispersed, Shinobu and Sanji examined the Flower Capital from a roof. The city was under lockdown and wanted posters of the alliance members were posted all over it, but Shinobu noted that the only thing left to do here was rescuing the people with the crescent moons on their ankles who had all been imprisoned in Rasetsu Town.
Shinobu later went to Amigasa Village in Kuri, where she took part in a meeting with the Nine Red Scabbards—save for Denjiro and Nekomamushi—and the Straw Hats to discuss their strategy for the final battle. There, Kin'emon revealed that in his sacrifice, Yasuie had changed the alliance's meeting place to Tokage Port to circumvent Orochi's discovery of their plot. Three days later, on the day before the raid, Momonosuke, the Scabbards, and Shinobu departed for Tokage Port, where they planned to meet their allies the next day. However, when they got to Tokage Port, none of their allies were there. With no ability to postpone the raid, the seven Scabbards decided to take a usable ship and take on Kaidou by themselves, leaving Momonosuke in Shinobu's care.
Kanjuro stayed behind on the coast in secret, sending a drawing clone onto the boat with the other retainers. By the time Kanjuro revealed that he was the one who was leaking information to Orochi, he had tied up Shinobu using snakes. After Kanjuro fled to Onigashima with Momonosuke in tow, Shinobu was freed and she joined the Scabbards on the Polar Tang. She apologized to Kin'emon for allowing Momonosuke to be captured. As the alliance was attacked by a Beasts Pirates ship with long-ranged cannons, Jinbe came to aid the rebels.
After the Straw Hats defeated the guards at the torii gates, Shinobu arrived at Onigashima with the rebels. She later joined Usopp, Tony Tony Chopper, Nami, and Carrot inside the Brachio Tank V. The group in the tank and Kin'emon's forces reached the Pleasure Hall owned by Black Maria. Shinobu, Nami, and Carrot volunteered to go look for Momonosuke. After they separated from Kin'emon's forces and the Brachio Tank V, they ran into Prometheus and quickly fled from the homie as it called Big Mom. While Nami and Carrot were captured, Shinobu was able to sneak away, allowing her to move undetected so she could save Momonosuke. When she attempted to free Momonosuke, King noticed her presence and threw her away. Momonosuke was then rescued by Sanji using his Raid Suit, and he passed Momonosuke off to Shinobu, who then flew off with the boy in tow.
After landing, Shinobu was told by Luffy to trust Yamato. However, when Yamato identified himself as Oden, Shinobu ran away with Momonosuke instead of accepting Yamato's help. While running from Yamato, Shinobu and Momonosuke were attacked by Sasaki's platoon. Shinobu was wounded protecting Momonosuke, but Yamato stepped in to protect them. Because of her injuries, Shinobu begged Yamato to protect Momonosuke. As Yamato continued taking attacks from Sasaki's squad, Shinobu urged Yamato to take Momonosuke and leave her behind. Franky (while in the General Franky) then arrived with Hatcha chasing after him. When trying to attack Franky with his club, Hatcha created a giant hole in the floor, giving Yamato an opportunity to escape with both Shinobu and the boy. They got out of the Skull Dome, but by that time, Kaidou already lifted the entire island above sea level. They then hid out in the storeroom inside the dome, where Shinobu listened to the story about Yamato's meeting with Portgas D. Ace and revealed that he had retrieved Oden's logbook.
Later, a mouse with an eye mask wandered into the storeroom. Yamato caught the mouse and revealed that it was a cyborg from Kaidou's surveillance unit. Their location was compromised and a group of Beasts Pirates stormed the storehouse. While hiding Momonosuke, Yamato and Shinobu fought their way out. In the Right Brain Tower, Yamato and Shinobu continued moving as Yamato asked Momonosuke if he was okay. Momonosuke said that he felt disgusted with himself because everyone thought highly of him yet he saw himself as weak and foolish. Shinobu denied this and called him brave, but Momonosuke refuted this claim and transformed into his dragon form at the same time, which surprised the two. After Momonosuke returned to his human form, he told them that Luffy was weak but still fighting Kaidou, and Shinobu was shocked at how he knew that.
After Shinobu contacted Kin'emon, she and Momonsuke hid in the crawlspace between the first and second floors, while Yamato left to act as a decoy. Momonosuke began reading his father's logbook, at which Shinobu peeked. When Momonosuke suddenly had a headache, Shinobu was in shock at Momonosuke's situation. They were later found and regrouped with both Kin'emon and Kikonoju who were just as in shock about Momonosuke's current headache as Shinobu was. Unbeknownst to anyone, Kanjuro also found Momonosuke and Shinobu and once again used his Oden imitation to trick both Shinobu and Momonosuke, before they were both informed by Kin'emon and Kikunojo that this was a fraud and Kanjurou found them. However, Kanjurou was nonetheless able to stab Kikunojo in his disguise, much to Shinobu's shock. Making things worse, soon after Kin'emon struck down Kanjuro, Kaidou appeared in front of all three, attempting to smash both Shinobu and Momonosuke, had it not been for Kin'emon's intervention, who asked Shinbou to take both her and Momonosuke to a safe place. She was still carrying Momonosuke when he, via a Mary, transmitted Luffy's message to everybody on Onigashima. They would later end up stuck on the roof, where they were found by Kaidou who once again tried to settle his unfinished business with them. As she saw no other way out, Shinobu used her Devil Fruit powers to let the ground beneath them crumble, sending them both downward and off Onigashima  When Luffy was saved by the Heart Pirates, Momonosuke talked in private to Shinobu, asking her to use her powers to make him an adult, to which she replied this would leave him mentally as a child and only alter him physically and urged him not to ask something like this from her.  Although she feared the consequences, she would still, although reluctantly, fulfill his wish, using her powers to turn Momonosuke into an adult, although this left her crying as she stated Momonosuke just looks like a certain someone.  She would later watch Luffy and Momonosuke depart towards Onigashima. 
- Shinobu, Kozuki Oden, and Nine Red Scabbards vs. Beasts Pirates
- Shinobu and Yamato vs. Beasts Pirates
- Shinobu means "to endure" or "to conceal oneself" and is the verb form for "shinobi".
- Shinobu's favorite food is hanpen. Fittingly enough, hanpen is one of the most common ingredients used in Oden, which fits into the ingredient theme used by Kozuki Oden's main retainers, the Nine Red Scabbards.
- In the SBS, Oda was asked if Shinobu had been modeled after Jane from the series Jungle King Tar-chan, written by one of his masters, Masaya Tokuhiro. Indeed, both Jane and Shinobu were pretty in their youth but aged badly. Instead, Oda revealed that she was inspired from famous Japanese comedian and actress Naomi Watanabe.