Nekomaru Nidai|

He is a very tall and muscular man with black hair and brown eyes. He wears a white tank top under a black gakuran, as well as blue sweatpants and Getas. He has chains around his neck with a whistle hanging in the middle, and emits a blue electric aura from his eyes. Nekomaru has two scars running from the top of both of his eyes down in their respective directions. He also has a towel tucked into the back of his pants. Much like Peko Pekoyama, he has also been mistaken for a cosplayer due to his appearance. During his time at Hope's Peak Academy, his appearance remains mostly the same. However, he wears a full tracksuit with his shirt unbuttoned and both are royal blue with a white stripe running down the sides of his figure. During his school years, he wore a set of white briefs made by a company called "Military World". His swimsuit in Danganronpa S: Ultimate Summer Camp consists of a pair of black boxers with an electric blue aura pattern. He also retains his chains and whistle. As Ultimate Despair, he wears a white suit with gold patterns, particularly a long white jacket. His blue electric aura appears to have changed to red.

Nekomaru is a vigorous, boisterous, and open-hearted student who has a passion for supporting athletes, but suffers from dyspepsia. He frequently shouts when speaking, as he is the team manager. He is very optimistic and his willpower is immeasurable, but he is not very intelligent and is very bad at lying. He also seems to greatly enjoy fighting, often in the form of very serious training. Nekomaru sees no shame in speaking about certain things that might make others feel embarrassed or uncomfortable. For example, he never misses a chance to loudly proclaim when he needs to go to the bathroom, which irritates Mahiru Koizumi and causes him to apologize. He also tends to get too close to other people's personal space, though he does so only to check their potential as athletes. Furthermore, as a self-proclaimed Ultimate Masseur, he frequently offers his special massage to others to the point of forcing them to receive his massage, as shown in his first and fifth Free Time Events with Hajime. He claims that his massage is his own ultimate weapon that can relieve fatigue in an instant, but it also seems to be highly addictive to the receiver. Although Nekomaru may look scary and aggressive, he has a very kind heart. He cries quite easily and isn't afraid to show it. As a team manager, he can be quite strict, but he is a great support and inspiration to his athletes and strives to improve them in any way he can. Teamwork and fighting spirit are very important to him. In his fifth Free Time Events, he states that he will give everything he has to fully support everyone so that they can escape the killing game together. True to his statement, he is the only one who willingly trained Akane by giving her a training routine and paid attention to the food she ate in order to stay fit and healthy. To stop the killings from continuing, he and Kazuichi Soda even tied up Nagito Komae.

Many athletes reach the top and set new records under Nekomaru's guidance. His talent, Ultimate Team Manager, should not be seen as an insult, as Nekomaru claims that there are no athletes who could have reached the top without the help of a manager. He believes that the bonds that are created between a manager and an athlete are the secret to many athletes' success.

In the past, Nekomaru had a baseball player who received an offer to join the major leagues while still in high school, a figure skater who performed six and a half spins, and a tennis player who managed to win a thirty-six hour match.

Nekomaru has worked in the managerial profession for quite some time. He could easily tell people who would have a good future as athletes just by looking at their body size. He suggested that Hajime Hinata play rugby under his supervision. Although Hajime thought that Nekomaru overestimated him, Nekomaru simply judged Hajime’s positive points, such as his calm judgment skills, high degree of mobility, and his knowledge of the importance of teamwork, which are all basic requirements for becoming a natural rugby player.

Nekomaru prepares different techniques to train his athletes for each sport, but he maintains that the best athletes must have these three essential things: physical fitness, visual acuity, and willpower. Once the athlete wishes to strengthen those three essential elements, he gladly prepares a solid and effective training regimen for them. He supports each athlete to achieve what they want to be and never allows himself to choose the sports available to his athletes. He said that it is a real challenge to bring out the maximum potential of each individual athlete.

Although Nekomaru's training is a bit harsh, little by little the trained athletes will get used to its principles and eventually win many competitions.

Before the tragedy Nekomaru was born with a heart defect that left him bedridden and confined to a hospital. The doctor who treated Nekomaru told him that he would only live until he was 20. Because of his illness, he was never able to play sports or participate in physical education classes at school. He was also teased a lot when he was young, was unable to make friends, and made frequent trips to the hospital. While in the hospital, Nekomaru met a boy named Daisuke, who suffered from the same condition. Daisuke was the team manager, and Nekomaru noticed how many people visited him in the hospital. When Daisuke died without seeing the team he had been training achieve their championship, Nekomaru was inspired to follow in his footsteps and make Daisuke's dream come true by becoming the team manager. Nekomaru quickly gained a reputation as a skilled team manager, leading several poorly trained teams to national recognition. His clients included baseball stars, figure skaters, and rugby teams. His work led to developing his muscles and learning a special massage for athletes using his fingers. He previously attended Yokoyama First High School before enrolling at Hope's Peak Academy.

During the tragedy: Following the death of the True Supreme Despair, Junko Enoshima, the Remnants of Supreme Despair agreed on a crazy plan to have the AI ​​Junko take over their bodies, so they could resurrect their leader.

Despair's remains are later found by the Future Foundation. Makoto Naegi plans to undo Junko's influence by placing them in the Neo World Program, but the program is taken over by AI Junko, as per Ultimate Despair's plan.

Danganronpa 3: The End of Hope's Peak High School - Future Arc Episode 01 - Third time's the charm As members of Ultimate Despair, as shown in the flashback, Nekomaru and Akane reinforced Fuyuhiko Kuzuryu and Peko who were fighting against the Future Foundation, but they were all eventually captured by the Future Foundation.

Danganronpa 2: Goodbye Despair Prologue: Welcome to Dangan Island! Panic on the exciting school trip!? Nekomaru introduces himself to Hajime outside the Mirai Hotel on the first day of the trip. Later, Nekomaru joins his classmates in relaxing on the beach at Usami's suggestion. When Monokuma appears and introduces the rules of the killing school trip, Nekomaru becomes uneasy, but remains adamant that no one will die.

Chapter 1 - Desperate Fate During the party hosted by the Ultimate Imposter in Chapter 1, Nekomaru suffers from constant digestive problems, but is unable to use the bathroom which was closed at the time. His testimony that the bathroom was closed before the blackout at the party becomes vital information that proves Peko's innocence in the murder of the Ultimate Imposter.

Chapter 2 - Sea and punishment, sin and coconuts In Chapter 2, Nekomaru works with Kazuichi Soda to tie up Nagito and keep him confined in the old building near the hotel, fearing that Nagito will become dangerous if left unchecked. Though the other students protest Nagito's treatment,

Although Hope's Peak Academy does not recognize him for his talents as a masseur, as a team manager he developed his skills as a masseur in order to help his athletes grow and fully prepare them for intense training by maximizing their blood flow. But he uses this technique very sparingly, as many become addicted to it very quickly. During a special event with Akane, Nekomaru gave her a full body massage and deep tissue treatment while she was in his cabin. He claims the title of 'Ultimate Masseur' is an alias belonging to him, believing that he has great skills in this field. He would likely have performed these techniques on his own athletes to improve their strength and reduce fatigue by massaging every pressure point. Nekomaru is very thorough when massaging his athletes and sees the need to not skimp on any massage for them to have their full effect. He gives Hajime a massage during their last free time events together, and Hajime states afterwards that his body feels "extremely light" and that he didn't want to admit that he couldn't live without Nekomaru's massage. He even allowed Hajime to do an impossible amount of training, proving the excellence of Nekomaru's massage therapy.

Hand to hand combat In physical combat, Nekomaru has been quite successful in his ability to match and surpass his enemies and friends. On many occasions during the Neo World Program, Nekomaru and Akane trained together. When Akane appeared at the restaurant in a swimsuit, she was covered in blood and stated that she had run into Nekomaru and had to fight him. Her wounds and scars were minor, but extensive, demonstrating the strength of Nekomaru's combat skills, and explained that Nekomaru was a surprisingly "strong opponent." When Gundham challenged Nekomaru to a life-or-death duel, Nekomaru accepted and did not run away. Gundham explained that Nekomaru was a "strong opponent" and that he was a "strong opponent."

In physical combat, Nekomaru has been quite successful in his ability to match and surpass his enemies and friends. On many occasions during the Neo World Program, Nekomaru and Akane trained together. When Akane appeared at the restaurant in her swimsuit, she was covered in blood and stated that she had run into Nekomaru and had to fight him. Her wounds and scars were minor, but extensive, showing the strength of Nekomaru's combat skills, explaining that Nekomaru was a surprisingly "strong opponent". When Gundham challenged Nekomaru to a life-or-death duel, Nekomaru accepted and did not run away. Gundham explained that Nekomaru "gave his all" to try and kill him, showing that Nekomaru was a worthy challenge.

When Nekomaru was revived by Hajime of the Neo World Program, he fought a Monobeast at the Future Foundation Headquarters, which was allied with the Super High School Level Elite Task Force. He was able to match the robot's power, using his arms to block its charge head on. Nekomaru outclassed the robot, despite his vast amount of strength, making it easy to imagine how strong he is against normal human opponents in hand-to-hand combat.