Nabeshima is a cocky and cheerful person who is almost always seen smiling. She dislikes natural geniuses, such as Kouki Akune, and has an interest in Zenkichi Hitoyoshi, wanting him to join the Judo Club and succeed her as the club's captain. While her devised plot to rid the Judo Club of Akune and simultaneously have Zenkichi join the Judo Club fails, she still arranges for Medaka Kurokami to accept Akune as the Secretary of the Student Council and continues to express an interest in Zenkichi. While she does not like admitting it, Nabeshima recognizes that she and Medaka are friends. She has a tendency to avoid situations where she could lose or get badly hurt, so she is regarded as a coward, and is rarely fazed after situations where others are emotionally and mentally scarred. She has several cat-like mannerisms.
Nabeshima has light green hair and purple eyes. She wears the standard girl's uniform of Hakoniwa Academy. Beneath this she wears a light green tank top and black sports pants. Nabeshima wears a red fingerless glove on her right hand when fighting outside the Judo hall. She also wears her Judo uniform when at the Judo Club. At the Seiyasai, Nabeshima wears a dark colored scarf with her uniform. Ten years later, Nabeshima grows a small ponytail, which is held up with beads.
Student Council Executive Arc
Nabeshima is present at Medaka's inauguration ceremony. At a later date, Nabeshima is seen sparring with Betsuhei Jounan. When she express her disapointment that the "Club Typhoon" Zenkichi is not coming, Jounan claims it must be because he is afraid, as their club did make it to nationals. Nabeshima chides him, reminding him that was only in singles matches. When she wonders why Zenkichi is going around to all the different clubs, Kouki Akune claims that Zenkichi is only trying to show off his strength, as the only one suitable to be beside Medaka is he. When Nabeshima asks if he knows Zenkichi, Akune replies that Zenkichi is an insect, while Medaka is his flower. Nabeshima leaves a request in the suggestion box asking for the Student Council to help her pick a successor. When Medaka and Zenkichi come to the club, Nabeshima greets both of them and calls for Akune. As Akune and Zenkichi aggressively greet each other, an amused Nabeshima looks on. After Medaka challenges the members of the Judo Club to come at her, Akune tells Nabeshima that Medaka is wasting her breath, as the two of them are the only ones who could fight Medaka on even footing. After Jounan is defeated in an instant by Medaka, Nabeshima acknowledges that Akune's earlier comment was correct, and questions Zenkichi on what he thinks. When he replies he has always seen Medaka as a monster who can do everything, Nabeshima agrees with him, then flirtatiously says she finds Zenkichi, who can keep up with Medaka, much more interesting. Zenkichi replies he is just being dragged around, at which Akune loses his temper, asks to take over Zenkichi's position, Nabeshima proposes they settle the argument with judo: if Akune beats Zenkichi, he will join the Student Council and Zenkichi will join the Judo Club. When Zenkichi disbelievingly asks Nabeshima if this was her plan all along, she admits it was, claiming she loves "go-getters" like Zenkichi.
Nabeshima sets the rules for the match: Akune wins when he scores ten points, Zenkichi wins if he can score one. As the match begins Nabeshima comments on Akune's genius, and Medaka guesses that Nabeshima hates geniuses. Nabeshima admits to it, and claims it is her mission to defeat geniuses with her hard work. Medaka wonders if this is why she became the foul king, to which Nabeshima only laughs. Nabeshima tells Medaka that she thinks the geniuses should be with the geniuses: she can have Akune and the Judo Club will take Zenkichi. Medaka tells her not to worry, as there is no such thing as a genius. Nabeshima brushes her off, thinking to herself that there is a genius right in front of her. Still thinking to herself, she tells Zenkichi it is fine to lose now, as in six months she will make him stronger Akune. Nabeshima is shocked along with the rest of the Judo Club when Zenkichi manages to win by using a two-handed topple to score a point off of Akune. As Nabeshima expresses her surprise, Medaka tells her that all there is is people trying hard, and that the two of them are no different. Nabeshima then tells Medaka that while Akune's judo looks very pretty, he has very nice handwriting as well. She later cuts Akune from the team, explaining that having a member stronger than the Captain would be bad for morale, but tells him that he can join the Student Council. When he claims that would violate his promise with Zenkichi, she asks him whether he wants to keep his promise or win Medaka. She also tells him to pass on to Zenkichi that she hasn't given up on him.
While looking for a new model for Kizashi Yuubaru, Akune approaches Nabeshima. After changing, she models for the artist along with Isagi Isahaya, though both are rejected. After Yuubaru rejects Zenkichi and Akune as well, she agrees with Isahaya that he is being too picky, pointing out that there are three beauties right in front of him. When Yuubaru decides on Hansode Shiranui, he is notably shocked with everyone else, and becomes depressed along with the other girls when Yuubaru decides she is perfect because her body is underdeveloped.
At the club battle swim meet, Nabeshima is seen as one of the participants representing the Judo Club, despite having retired. After Medaka announces that the Student Council will be taking part in the swim meet as well, Nabeshima is thrilled at having the chance to compete with her. Waiting for the first event to begin, Nabeshima approaches Zenkichi and Akune and asks if they didn't make a mistake with the rules, handicapping the boys by making them wear flotation devices, as the first event requires that participants dive down beneath the water. When the boys point out that she is taking advantage of the rules by having only girls on her team, she openly admits it. After Medaka hopes the two of them can have a good fight, Nabeshima grudgingly agrees, thinking to herself that the handicap doesn't apply to Medaka. After the game begins, Nabeshima finds herself and her team struggling, and though she tells her fellow teammates to stop calling her captain, she worries to herself that the game is much harder than she imagined. She wonders how the Student Council are doing, and is shocked when she sees Zenkichi and Akune getting out of the water. When she demands to know why, Akune tells her they would just be getting in Medaka's way. Not seeing the person in question, she asks where Medaka is, a question Zenkichi cryptically answers. Medaka then bursts out from underwater, startling Nabeshima. After the first event ends, Nabeshima angrily tells herself that she won't lose to Medaka, while her teammates look on.
Waiting for the second event to start, Nabeshima approaches Medaka, asking why she isn't participating. Medaka responds that doing so wouldn't make it much of a team competition, and points out that Nabeshima is doing the same. Nabeshima goes on to talk about the Swimming Club, mentioning that they will do anything even for only a penny. She talks about Umumichi Yakushima in particular, claiming that she admires his raw talent, but that she can never tell what he is thinking. She is somewhat startled when Mogana Kikaijima intrudes on their conversation to explain what the Swimming Club's dream is. Nabeshima takes part in the third event, eel catching, managing to capture nine eels. At the end of the swim meet's fourth event, the winner of the competition is revealed to be the Judo Club. Asa explains that while the Student Council and the Swimming Club were caught up in their soap opera, the Judo Club managed to stead all the other teams headbands, racking up a total of a hundred and three points. Nabeshima confronts Medaka, telling the younger girl that using dirty methods to win against clean opponents is how she always wins, but that she will be waiting for Medaka so that she can beat her head on. The Judo Club receives the promised finding, but Nabeshima tells the Student Council that they don't need that much, and gives the rest to the other clubs.
Thirteen Party Arc
Nabeshima is sleeping in class when the seniors hear of a fight between Medaka and Myouga Unzen. After Yakushima addresses her as the Judo Club Captain, she corrects him by stating that she is the former Captain. As Medaka is about to be struck, Nabeshima trips her up, causing the incoming attack to miss. The hallway erupts in cheers at the sight of the Foul King, but Nabeshima brushes the praise off. She confronts Myouga, and though she initially appears infuriated that Medaka has been attacked, she quickly reverts to her usual demeanor. Pulling off her school uniform, Nabeshima states her intent to enter the fight. As Myouga lunges, Nabeshima punches her in the face, causing the crowd to comment that she is fouling already. Nabeshima taunts Myouga, promising to defeat the Abnormal with her fists alone.
Myouga discards her balls and chains, prompting Nabeshima to ask if she is going to pull a Dragonball and speed up. Myouga does, and is able to get behind Nabeshima and knock the older girl to the ground before she can react. Myouga hauls her up with the intent to beat her into unconsciousness a hundred times. Nabeshima suddenly awakens and grabs onto Myouga, revealing she was just playing possum. She chastises Myouga for getting within a Judo practitioner's range, and drops her with a full point back flip. As Myouga shakily rises, Nabeshima grabs her around the waist. She tells Myouga she will stop once the younger girl has lost consciousness, before dropping her on her head. Afterwards, Nabeshima talks with Medaka, and tells the younger girl that it would have been better if she had fought, as Medaka could have defeated Myouga without hurting her. Medaka thanks Nabeshima for her advice before leaving, and Nabeshima wonders if she has woken a sleeping lion.
As Zenkichi tells the Student Council they have to regroup outside the Flask Plan labs, Nabeshima arrives along with Myouri Unzen, Harigane Onigase, Myouga, Shigusa Takachiho, and Kei Munakata to provide support. Nabeshima tells Zenkichi that the Loser Team came to help the Student Council, after being alerted by Shiranui's Twitter page. Everyone else is put out when Nabeshima suggests they use the elevator. She stands by the elevator with everyone else. She has nothing to say when Gunki Itoshima accuses her of being a cheater for trying to use the elevator. Nabeshima is amused to see Unzen's efforts to make the Student Council leave. Together, the Loser Team prepares to fight the Plus Six. Nabeshima and the others are quickly captured by Yutori Chikuzen's hair; however, they are cut free by Munakata. While the other members of the Loser Team battle the Plus Six, she and Unzen stand to the side, observing the stationary Gunki Itoshima and Hamaya Hyakuchou. Nabeshima declines making the first move against them, but points out that a standoff could work in their favor, to buy time for the Student Council to rescue Medaka. While Medaka and company prepare to descend to the thirteenth floor, Nabeshima and the others are still fighting the Plus Six. Nabeshima and Unzen are still sitting on the sidelines. Later, she, along with the rest of the Loser Team and the Plus Six, is defeated by Misogi Kumagawa.
Kumagawa Incident Arc
After Kumagawa leaves, Nabeshima reveals that she was just playing dead. She is surprised to realize she was the only one who did so. She then shows that her wounds are already starting to heal, noting that Kumagawa's abilities leave the Abnormal territory and seem more akin to the occult. Following the battle, Nabeshima is the only one of Kumagawa's victims not to be sent to the hospital for severe mental damage. At the end of the semester, Nabeshima is present for Medaka's speech. She is surprised by Kumagawa's sudden entrance, and declaration that he is Medaka's ex. Asked by Yakushima about the rules Kumagawa is quoting, Nabeshima explains it is about Student Council member selection. She is surprised Medaka knows about the academy rules from when it was a cram school. Nabeshima and Unzen watch the general affairs manager's battle with binoculars from a rooftop. Nabeshima is impressed by Zenkichi's performance, remarking that he has found a good teacher. When Kumagawa turns to address her and Unzen, Nabeshima is amazed that he can see and hear them from so far away. One week later, in the Public Morals Committee's office, Nabeshima asks Unzen why they are not watching the secretary's battle. After Unzen explains, she asks after Youka Naze. Making her way through the halls with Unzen after the Treasurer's Battle, Nabeshima asks him what he thought of the match. The two come across a collapsed Maguro Kurokami, who asks them to take him to Medaka. Nabeshima tells him that Shibuki Shibushi has already been defeated. On August fifteenth, Nabeshima and Unzen make their way through the halls to the Vice-President's Battle, running late due to the Unzen siblings visiting their family graves. They are stopped by three girls, who ask for directions to the Vice-President's Battle. As Kuudou Hinokage struggles against Gagamaru Chougasaki Nabeshima and Unzen lead the student body to cheer for him, Nabeshima having distracted the Election Management Committee. On August twenty-second, Nabeshima and Unzen stop a group of students who want to attend the President's Battle to cheer for Medaka. Nabeshima explains that no one can follow the match because of the intensity of the participants' fighting.
Kurokami Medaka's Successor Arc
She is the one who looks out for cheaters in the bloody seven game as no one wants to be called a cheater by her.
Unknown Shiranui Arc
Along with Akune, Nabeshima faces Medaka in a two-on-one Judo match. The match ends in a tie, and as the three towel off, Nabeshima expresses her relief that the match ended as such. When Akune does not recognize Shiranui's name, Nabeshima tells him Medaka must be talking about the chairman. When Medaka insists she is talking about his granddaughter however, both Nabeshima and Akune claim not to know who she is talking about. As Zenkichi hovers near death, Nabeshima's voice is one of the many that gives him encouragement. She is also one of the people he remembers before preparing to fight Iihiko Shishime. At the end of the academic year, Nabeshima is among the graduating students present at the Hakoniwa Academy graduation ceremony.
Bouquet Toss To The Future Arc
Nabeshima is one of the seniors Zenkichi calls to fight Medaka as part of the 100 Flowers Run. Nabeshima is seen waiting for Medaka after she defeats the Shiranui family. Nabeshima hands over her flower without a fight, telling her their fight will have to wait fifty years. Her message to Medaka is a goodbye.
Ten years later, Nabeshima won a gold medal at the Olympics, despite snapping the ligaments in one of her knees. She is now retired, and teaches children in a small judo class. She is working with Aoki Aka towards a possible recovery.
Combat Expert: Nabeshima is the former captain of the school's Judo Club; her skills in Judo outrank even Akune, who is a second dan and known as the "Prince of Judo". Because she does not hesitate to cheat outside of official matches, Nabeshima is known as the "King of Fouls" (反則王 Hansoku Ō), in the Judo world. Not only does she fight dirty, but she relishes the chance to do so. When fighting the Abnormal Myouga, not a single student present was concerned that Nabeshima would lose.
- Nabeshima was voted the nineteenth most popular character in the series in the second popularity poll with 154 votes.
- Nabeshima was voted the eleventh most popular character in the series in the first popularity poll with 184 votes.