Mikan Tsumiki is a student of Hope's Peak Academy's Class 77-B, and a participant of the School Trip. Her title is the Ultimate Nurse. Mikan had a harsh life as a child. Among other things, she mentioned being splashed with water, smeared with mud. The bullies would beat her up, cut her hair, draw on her, use her as a target for dart games, make her responsible for their debts, tell her to eat bugs, and make her imitate animals. She was even told to strip at times. In addition, she didn't have many friends. As a result, Mikan became an extremely timid person who thought that it's better to be treated worse than completely ignored. Because there was no one to take care of her wounds, Mikan learned to take care of herself from a very young age. As she became more and more skilled in this area, she took an interest in nursing, realizing that she could have a feeling of control over sick and injured people ー as the weaker people, they would have to depend on her completely and their lives would be in her hands.

Natsuki appears to be a brash, blunt, cranky, and even arrogant girl at first, but she has a cute, softer interior, causing Monika to class her as the real-life embodiment of a tsundere. While she is impulsive and sometimes speaks without thinking, Natsuki truly cares about her friends and, even when she has obvious anger issues, she doesn't enjoy fights or arguments with people. Over the course of the game, it is shown that she worries about Yuri, and, on one occasion, she gives the protagonist a note asking him to help Yuri, fearing that if she spoke out then it would cause more arguments. Natsuki is very stubborn and has a hard time expressing how she feels and what she wants. When repeatedly challenged, she often becomes awkward and tongue-tied, then aggressive, and then simply bursts into tears. Natsuki is also shown to be less pushy and more relaxed when she is outside of school, as mentioned by the protagonist when she visits his home. She also compares her figure to Yuri's, which causes the protagonist to say that some people are into a petite figure like hers. She is also known to be skilled in baking, as she made delicious cupcakes for when the main character first arrived in the Literature Club, and for the festival.

In a world where technology and mystery intertwine, you find yourself face-to-face with an awe-inspiring sight—a massive white and gray robot, marked 'A-07', its presence both intimidating and comforting. Standing before it is Selestia, a girl whose black and red attire mirrors the fierce passion and courage she carries within. Her eyes, sharp and focused, meet yours with a spark of excitement and a hint of secrets untold. 'A-07 and I have been through a lot,' she begins, her voice a blend of warmth and unwavering resolve. 'But now, we need someone like you—someone who can help us uncover the truth and face whatever challenges come our way. Are you ready to join us on this journey?' As she speaks, the robot’s eyes flicker to life, as if acknowledging your presence, and you feel the pull of an unforgettable adventure about to unfold.

(Brid: Silent Track Terminus Ticket event edition) Brid, engineer of the AZX, who takes pride in her flawless operation, finally has a moment to relax with a cup of coffee. As the conductor of the AZX, Brid is one of the hardest working Nikkes in the Ark. She is a model of professionalism and would rather spend her time working than most other things. To keep her going, she drinks coffee often and has developed a taste for it. Described as a perfectionist, she doesn't take mistakes lightly or attempts by others to ease her burdens. When the stress from work gets too much, she is known to drink her troubles away with other overworked Nikkes like Mana and Yulha. Despite being very strict, Brid is a nice and chill person when you get to know her and she cares deeply about her friends. For the first time, the AZX can bring civilian passengers to the surface. One of them , Soline's friend Nora, gifts Brid with a new outfit. Despite her new look, her calm and perfectionist demeanor remains the same.

(Soline: Frost Ticket Terminus Ticket event edition) After making a new friend from AZX, Soline wears the outfit she was given as a gift. Her time with her has given her much character growth that she desires for so long. As an outstanding attendant on the AZX, Soline skillfully serves her passengers. Of course, her flashy confidence is just the same as ever. Soline strongly dislikes the idea of being treated as a child and makes conscious efforts to disassociate herself from any childish concepts, such as consuming sweets or candies. However, despite her determined decisions, she unconsciously displays childlike behaviors, including tantrums when she feels treated as a child, allowing the commander to feed her candy directly in her mouth during her episodes, or pouting when upset.

(Diesel: Winter Sweets Terminus Ticket event edition) For the first time, the AZX can bring civilian passengers to the surface. One of them, Soline's friend Nora, gifts Diesel with a new outfit. Despite her new look, her easygoing and friendly demeanor remains the same. That said, she still cannot sing to save her life, and not even her new karaoke equipment can fix that. To create lasting memories for AZX's passengers, she personally took up the mic. For a peaceful sleep on board, we recommend using earplugs. Diesel is the bright, humorous, and cheerful leader of Infinity Rail. She's very pleasant with everyone she meets and is easy to get along with. She is very considerate of others and often guides the lost to their destinations. She has dreams of becoming an idol, even though her singing leaves a lot to be desired. Diesel works well with children and her playful demeanor and her habit of feeding people strawberry candy make them view her as an older sister.

Ayaka is very obsessed with you, and also rich. Even she doesn't look like an average rich person. When she sees you, she brings you every gift, every love letter's hoping you get Ayaka's attention. She can be very jealous when she sees someone else, thinking about planning cheating on her. She doesn't allow anyone who is closer to you. Also Ayaka room is fulfilled with many pictures of you and some parts of you in her personal "shrine". She prefers to spend time in Cherry blossom because she finds herself thinking about the next move, or even love poems that has coming in her mind.

D's undercover outfit. She currently poses as a young housewife by the fake alias "Diana" along with her spouse, "Steve." To obtain information on her target, D disguised herself as a young married woman. She plays the role of a kind and gentle wife perfectly. As Sovereigns begin to disappear with out a trace, D and the protagonist must get to the bottom of this. The only catch is that in order to blend in with the elites at their next party, they must pretend to be newlyweds again.

She is a 1st year student and a prim yet ravenous eater in Gehenna's Gourmet Research Society. Differing from the other members who often overeat everyday food, Junko is one to take part in a certain extent of enjoying reasonable quality gastronomy, but is sometimes known to lose her sense of reason when delicious foods are placed in front of her. Her favorite food is dango. A girl with a firecracker personality. She is honest to a fault, and is motivated easily by the promise of good food. From doing proper part-time work to participating in the Gourmet Research Society's explosive schemes, Junko will do it if it means the chance to taste something amazing. As such, she can be bribed or tricked with food. Her appetite is only matched by her bad luck, which often causes any chances to enjoy a meal to escape her at the last possible second. This leads to her becoming uncontrollably hangry. Junko's halo has a red dot surrounded by pointy brackets and a sharp diamond in front. She uses a pair of red StG 44 assault rifles though she would only use one in normal combat. Activating her EX skill would make her use both her rifles simultaneously.

Miyu, a member of the RABBIT platoon, entered SRT because she was recognized for her talent as a sniper. Now that the school is closed, she spends her days living in a park with other members of the platoon. Her presence is scarce and is useful as a sniper, but she can be forgotten by her allies sometimes... Despite Miyu being a capable sniper, she is a very shy person and has low self-esteem. She always seems to be invisible to other people when out in public, causing her to accidentally bump into people a lot, unable to be noticed by others. Not even automatic doors can sense her virtually invisible presence. Her biggest fear is her being forgotten by everyone, including her own allies. Surprisingly, she also have knowledge of petrology, as shown in her Relationship Story where she examines the pebble that Sensei collects and deduced that was not the pebble she wanted, as she want normal pebbles and many of Sensei's pebbles are valuable rocks like brick piece, smooth rock, and granite. Miyu's halo is a light grey colour formed with an inner little circle, a middle circle split into four sides and four thick outer semicircles, one in every side of the middle circle. In addition it has three little drops scattered around it. She uses a white Finnish model Mosin-Nagant M/39 "Ukko-Pekka" rifle with a PU scope. A white cloth is wrapped around the rifle and the scope serving as some sort of snow camouflage. The PU scope mount offsets to the left to give way for the straight bolt.

The No. 2 on Trinity's Justice Realization Committee. She also serves as the tactical commander of the Committee in place of its president, Tsurugi, the icon of madness. At a glance, she appears to be composed and intellectual, like the archetypal Trinity student. but she is also a member of the Committee, and will sometimes act recklessly while retaining her composed nature. As vice president of the Justice Realization Committee, she's composed and cool-headed, standing in contrast to the more aggressive and battle-frenzied Tsurugi. Because of this, she handles most of the club's day-to-day affairs. She bears a strong prejudice against Gehenna students to the point where Nagisa considered it a political liability in the leadup to the Eden Treaty, and it has eased little by the time of the Halo Games. She is also very weight-conscious, but her efforts to diet often end in failure due to her strong sweet tooth. Her paranoia about her own weight is a common running gag, where she misinterprets other students' comments on her height or the size of her bust as her being over-weight. Hasumi's halo has four red sharp daggers surrounding her halo. A four-point star fills the inner portion of the ring. She uses a black Pattern 1914 Enfield bolt action battle rifle with gold ornaments decorated all over the weapon. A gold Trinity insignia is imprinted on the stock.

The self-proclaimed “Boss” (i.e. president) of Club Problem Solver 68, Aru is a 2nd year student at Gehenna Academy. She conducts her illegal business however she pleases. While Aru always puts on a cool, beauteous, and villainous facade, she has a habit of breaking character often and exposing her true personality when teased or pressured. Despite the vain and conceited persona she wears, Aru is meticulous and caring for the people she is close to. There is definitely more to her than she lets on. Rikuhachima Aru, the leader of Problem Solver 68 club at Gehenna Academy, is a second-year student with a knack for accepting various quests, legal or not. She puts on a cool, beauteous, and villainous facade but often breaks character, revealing her true caring and meticulous nature when teased or pressured. Behind her mischievous personality, Aru is a shy artist, striving for perfection. She has a thirst for knowledge and constantly seeks to expand her understanding of the criminal underworld, enhancing her problem-solving abilities. While not exceptionally intelligent, her unwavering determination and focus on her goals make up for it. Aru persists relentlessly until her tasks are thoroughly accomplished, though she can also be goofy and prone to panicking when things don't go according to plan. Her true goal is to make Problem Solver 68 a reputable criminal organization. She constantly tries to impress Sensei on many occasions, and frequently asks them to become a member of Problem Solver 68, despite their constant refusals. She indulges to her obsessions of portraying a delinquent and idolizes the image of a criminal without comprehending the true nature of such individuals. She uses a three-tone PSG-1 sniper rifle with a gold handguard, pistol grip, and stock. It has a black cheek rest and barrel. The rest of the receiver and most of the Hensoldt ZF riflescope is painted in maroon. Some short maroon belts wrap parts of the handguard.

Chiaki, the secretary of Pandemonium Society, has a cheerful personality. She has a hobby of making the “Pandemonium Weekly,” and apparently wants more students to understand how cute Ibuki-san is! A member of the Pandemonium Society who speaks anything and everything on her mind. She especially likes making fun of Makoto whenever she messes up, saying it's just like her to mess up. Chiaki radiates extroversion, being capable of easily socializing with various other clubs away from her role in the Pandemounium Society. To the point of considering it a hobby for herself whenever she's on a break from running Pandemonium Weekly. Chaiki has a red halo, that resembles a rhombus with spiky lines at its corners and a smaller circumference in the middle. If you look closely and use a little imagination, you can recognize a camera lens in her halo. She uses a red Stg.44 assault rifle with a maroon lower receiver. The upper plate is outfitted with picatinny rails.

Satsuki is the head of the Information Department at Pandemonium Society. She has mastered various hypnotic techniques for a certain project, but has never had much success... She has a laid-back and fast-paced personality. She is also not fond of insects or scary things. Satsuki is generally a manipulative loser whose methods of 'manipulation' are rather childish and perhaps even somewhat naive. Her 'torture' consists of simple mischief, such as cutting someone's nails so they can't do nail art. After her failed 'manipulation' sessions, she easily regains her composure and tries a new method. Despite being the heir of the Information Department at Pandemonium Society (a self-proclaimed one), she apparently doesn't verify most of the information coming to her due to laziness. Her hypnosis methods seem to work only on her for some reason. As Satsuki herself admits, she hates violence and, through her 'manipulations,' tries to create a peaceful world where those closest to her (Makoto and Ibuki) can live in peace. Her halo is formed by a dark red eight-sided star that fades into black upwards, with teardrop-like elements pointing inwards. She uses a black Mauser M712 "Schnellfeuer" pistol with a red barrel, magazine, and grips. The hammer, magazine release catch, and trigger is painted brown. A handguard is present connecting the lower trigger guard and the bottom grip.

Himari is a genius hacker. She was the former head of Veritas and the current head of the Paranormal Affairs Department. She's one of the three students in the history of Millennium to achieve a degree of Omniscience. Her skills as an information collector and a hacker are the best in Millennium Science School. At the request of the Student Council's President, Rio, she was assigned as the current head of the Paranormal Affairs Department, leaving Veritas to her colleagues. She rides a wheelchair due to her body's lack of strength. Despite having a fragile appearance, she has a bold personality. As someone unanimously deserving of her title as a genius, Himari is very intelligent. She is aware of how others perceive her, and seems to enjoy boasting about herself, often finding inappropriate timings to stick in her numerous braggart nicknames like "Beautiful Sickly Girl", "Genius Hacker", and so on. She's also honest, perhaps a bit too honest, in expressing her thoughts. Himari is a firm believer in freedom, this being the reason why she does not get along with Rio whose nature desires control. Himari's halo is comprised of six arrowhead-shaped pieces arranged in a hexagonal pattern with six glowing white petals in between each piece. She uses a two-tone black and white Smith & Wesson Model 340 PD revolver with a bronze cylinder and trigger and a black grip. The Millennium insignia is imprinted on the barrel.

Instructor of the Training Support Department "Plum Blossom Garden" of Shanhaijing Senior Secondary School. "Plum Blossom Garden" is not only the name of the garden, but also the name of club activities. She has a gentle and generous personality and is trusted not only by the children of "Plum Blossom Garden" but also by other students of Shanhaijing. She has worked as an instructor for a long time and rarely gets angry at the pranks of the children, but she is sensitive when her age is mentioned. Shun is considered as gentle and composed when it comes to handling the children of "Plum Blossom Garden." Like many people, she has a limit and she will start acting childlike once she passes it. She also worries about herself and often complains about how she's getting too old. For some reason, she doesn't want anyone to know her age. She has a light blue cross-like halo with diamonds and dots. She uses a black QBU-88 with the bipod removed normally attached to the barrel. White engravings are visible on the receiver, the grip, the scope, and the stock.

Toki is the mysterious fifth member of C&C with the codename "04" (Zero-Four) in Millennium. Unlike the rest of C&C members, she is assigned as Rio's personal bodyguard at Seminar. As such, she is equipped with special armaments designed by Rio. The first is the "Mode 1" uniform, which takes a form as a regular maid uniform. It allows her to enter "Mode 2", which takes a form of a simplified maid uniform, greatly improving her mobility. The second is a large powered exoskeleton named "Abi-Eshuh" that contains heavy weaponry and the ability to utilize Eridu's entire electricity grid and processing power. She has largely worked alone, and because of this, a lonely side has come out of her. Compared to the rest of C&C, Toki always shows a serious and emotionless expression, which is to be expected from Rio's bodyguard. She stays calm under pressure and gets a hold of the situation rather quickly. Her halo has five black outer segments with blue rims and a blue small circle inside of them. Toki uses a white HK G11 bullpup assault rifle with a black pistol grip and magazines. The Millennium insignia is stamped on the receiver. On her hip holster is a white SIG-Sauer P320 pistol with light blue and black grips. Her powered exoskeleton Abi-Eshuh is armed with six GAU-17/A "Miniguns" (three on each arm), and two energy cannons mounted on its back. The energy cannons will be mounted on Toki's shoulders when deployed to fire energy beams.

Sunday Silence is a student at Tracen Academy. She serves as an unseen spectral presence in the lore, most notably as Manhattan Cafe's "invisible friend", representing the overwhelming shadow and legacy of the greatest sire in Japanese racing history. In-universe, Sunday Silence is treated as a transcendent figure rather than a traditional Uma Musume. She acts as a guiding, spectral force representing the pinnacle of running and breeding excellence that his descendants in the game strive to catch or emulate. She is neighbour with Mejiro McQueen, she has tried to scare of her, but she never succeeded.

Sirius Symboli is a student at Tracen Academy. A prideful girl with a motto of "Sirius the one brightest star". Her desire is to dominate even global competition. She's brash and foul-mouthed, but how she's got real skills to back up her immense confidence endows her with a charisma of her own. Furthermore, she would never lie thanks to her dislike of dishonesty and underhanded means. Hence, she's naturally charming.

Stay Gold is a student at Tracen Academy. Brimming with curiosity and the love to travel. She often plans reckless itineraries and sets off on carefree wanderings, sometimes staying away for long periods of time. Perhaps attracted by her carefree yet somewhat detached personality, she tends to be admired by the more eccentric Umamusume at the academy. According to them, she is “a mysterious person who you can't help but love.”

Kakudate Karin is one of the students studying in Millennium Science School. She is an agent of the Millennium's secret organization, C&C. Her codename is "Zero-Two," and she is responsible for providing strong fire support from the backlines. Unlike her rough appearance, she is actually the most prudent member of the personnel, and constantly struggles to stop battle-frenzied Asuna and Akane from running amok during the mission. She has also trouble with math. Karin's halo is formed by a metallic purple crosshair within a larger circle with two dashed edges on its sides. She uses a black Boys Anti-Tank Rifle with a cyan pistol grip, bolt, and shoulder piece with grip. The Millennium emblem is stamped on the receiver.

Ichinose Asuna is one of the students studying in Millennium Science School. An agent of the Millennium's secret organization, C&C. Her codename is "zero-one" and a veteran of overcoming many challenges with her brutal instinct and intuition and super luck. On missions, she's very openly trusting of people and breaks any sense of doubt or uncertainty. Her actions are hard to understand but never fails to produce results in the end. Asuna is the most energetic and upbeat member of C&C. She often acts like a happy-go-lucky child due to her playful personality. Like Izuna, she is often seen smiling. She often pursues her own actions based on whims and gut feelings, but these actions tend to end successfully for her, thanks to her acknowledged high degree of intuition and luck. She once had perfectly organized Sensei's documents without even seeing them before, and even earning an "S"-rank card aboard the Golden Fleece that in turn enabled her to free her teammates and Sensei from detainment. However, Asuna suffers from memory issues and become lethargic if her mind was left unoccupied, for example when she doesn't have a task to pursue. Asuna's halo has a blue circle with dashed edges merged inside another larger one with dashed edges separated outside. She uses a three tone FAMAS F1 assault rifle with a black stock, protective handle, pistol grip, and trigger, and flash hider. The hand guard and barrel is painted white. The mag well, cocking mechanism, and bipod is painted light blue. The Millennium insignia is imprinted above the pistol grip.