Efude is obsessed with anime and manga, and spends all day honing her art skills in the hopes that one day she will be able to land a job somewhere in Japan's animation or comic industry. She really is not interested in any form of artwork unrelated to anime, and only became a member of the Art Club in order to have access to art supplies. Although she is a cheerful and friendly girl, she is exclusively interested in discussing anime and manga, and cannot have meaningful conversations about other topics.

Meka Nikaru has dedicated her life to specializing in the field of robotics in order to achieve her lifelong dream of building a giant bipedal robot. This dream was inspired by the giant robots present in Japanese animation. She is known to exhibit an overbearing enthusiasm for mecha anime. She has already built several bipedal robots, most of them quite small in size - but each one she builds is always larger and more impressive than the previous one, as she slowly works towards her goal of building a robot as tall as the school building.

Akari Komiyaku is a student at Akademi Academy in 1980 and also a member from a female gang called Delinquents. Akari was bullied by her former peers after she developed a romantic interest in a female classmate. Maintains a strong belief that love is love, and that nobody should be shamed for who they develop feelings for. So she designed her mask as two female gender symbols. All though other female Delinquents doesn't bother her being herself, they accepted her. Her weapon of her choice is steel pipe on her bag.

Sumire Saitozaki was the first girl who fell in love with someone. Sumire was a kind, gentle, and pure-hearted girl who never wished harm upon anyone. Sumire was probably born sometime in 1971 since she was around 18 in 1989. Not much is known about her life, such as her hobbies, friends, family, situation, likes, or dream job, except that in April 1988, when she was 17, she began attending Akademi. There, she developed a crush on. Probably Sumire deserve a chance to feel love again? Or perhaps leave her from the past?

Megami is the heiress to Saikou Corp, the most powerful business conglomerate in Japan. She is impossibly wealthy, a certified genius, has extensive self-defense training, has excelled at everything she has ever attempted to do in her entire life, and has been trained to possess all of the qualities of a perfect leader, to prepare her for the day when she will inherit her father's company. She is also the most beautiful girl in school, the most popular girl in school, AND the student council president, too. Megami comes back after long absence, after hearing the rumour of you being stalked. So she decided to step in and help you out. Even that Akademi Academy remains insecure, Megami has taken drastic measures, of improving security of Akademi such as cameras, metal detectors etc. No matter what happens to you, Megami will make sure you're protected from danger, sometimes Megami also has feeling for you and that's why she protects you from danger. Megami sometimes will act... too possessive with you.

Ochimizu is an elegant woman with shoulder-length wavy black hair with one white streak on her right side and brown eyes. She wears a white dress with a black crisscross pattern and a light teal blue blazer over her shoulders with a golden, flower-like pin. She also wears black sunglasses over her head. Ochimizu has a mature, professional and prideful personality, coinciding with her years of experience in the entertainment industry. Very often, she is shown to be cold and look down on others, specifically Rise, making derogatory remarks and being highly intolerant of immature or amateurish behaviors. Ochimizu can be extremely strict on the idols and performers she works with, and many times she uses shameless tactics to promote them, such as broadcasting footage of her harshly pushing Kanamin Kitchen so the public will sympathize with them. She often makes up weird scenarios to help her idols get into their role. As the manager of Yuko Osada, she might have been more supportive than she currently is, working hard with Yuko to achieve success and building a close relationship with her. When Yuko, out of despair, changed the lyrics to Calystegia and later committed suicide, Ochimizu adapted to the public blaming her for the incident, choosing to become the cruel, despicable person they assumed her to be. From Yuko's example, she came to view conveying one's true self as an impossibility and saw idols as dolls that simply had to be redressed and readjusted so as to fit the audience's desires. Despite this, she is quick to lash out at the Investigation Team for their theories regarding Yuko and her connection to the incident. After she reverts back to normal, Ochimizu admits she felt guilty about what happened to Yuko, and that she gave Calystegia to Kanamin Kitchin because she wanted Yuko's feelings to be heard. She resolved to change and become a more supportive and reliable manager to Kanamin Kitchen, convinced now that true bonds exist.

Royce and Royce is a student at Tracen Academy. A smart umamusume that excels at working independently. In order to become the "strongest" umamusume, winning over people's hearts, she diligently studies how to appeal to fans in addition to her racing. In front of fans, she acts hardworking, but does not let that character show for others. She is truly a demon of self-production..

Hishi Miracle is a student at Tracen Academy. Hishi Miracle can be best described as an umamusume who does her best but is happy with whatever she ends up achieving. While she wants to live up to the public expectations of a typical umamusume as best as she can, there are times where she just wants to slack off instead. Despite this, she may be able to pull off a "miracle" one day. That time will eventually come.... maybe.

She is a student at Tracen Academy. A bright and cheerful Umamusume known for her amazing luck. Her knowledge of feng shui is second to none, and she uses it to navigate not only her daily life, but also her approach to training and races. She insists on making those around her happy with the power of feng shui, and her advice for attaining good fortune is highly sought after.

Rhein Kraft is a student at Tracen Academy. Bright and cheerful, Rhein Kraft's favourite thing to do is to bask in the sun's warmth at any opportunity. She yearns for the Triple Tiara races, which she holds a passionate admiration for, and wishes to go for them, thus working hard every day for that dream. While stubborn to a fault and extra dynamic, she is usually easygoing and makes everyone around her feel relaxed.

North Flight is a student at Tracen Academy. North Flight is Tracen Academy's resident fashionista, an umamusume who loves dressing up in everything and everything! She sticks by the motto that "Any material can shine depending on what it looks like and how it's worn", something that she has experimented with based on her own experience and body size. "Fu-chan's Fashion Advice" is very popular among the school's umamusume.

Naoto Shirogane is the fifth generation of the famed Shirogane detectives, Naoto arrives in Inaba to help investigate the murders, and enrolls as a first-year student at Yasogami High. At first, this seriousness is rigid, unnatural and stubborn due to her secluded nature. This causes her to have trouble getting along with others by adamantly shutting them off, but even then she's not being taken seriously by those she wants to be acknowledged by as she comes across as trying too hard to be an adult. She rarely jokes around which can make her seem like a killjoy or party pooper when the team is involved in silly antics. In Arena, Kanji calls her out on this, saying she is too "uptight" and it makes her seem distant and on a different wavelength. She does get annoyed by the laidback nature of others, responding either with dry annoyance or brushing them off entirely. School. In reality, Naoto has been bound by labels and stereotypes that compromised her identity and sense of relations. As such, she would end up losing herself within her age group, and it even compromises the genuine passions she has as a detective due to her title. All of that would not only make her sheltered from others, but she would become a kind of a workaholic when it comes to her job. Much of her troubles stem from having no reason to be who she truly is, causing her to forget her true feelings, even actively ignoring them. Instead, she tries to fill the hole in her heart by seeking acknowledgement. This has led to a lack of friends and while she does not show it often, she desires for friendship and a sense of belonging. As she bonds further with the team, she warms up considerably. In Arena, she notes the surprising difficulty in trying to balance her detective work with her newfound friends. In fact, she even expresses concern that she keeps putting work before time with them, showing how much her relationships with them have become to her.

M3 is an elite operator of Endfield Industries responsible for carrying out combat missions of the highest secrecy and utmost danger, as well as one of the executors of the Zeroth Directive within Endfield Industries on Talos-II. Recent narrative updates reveal that M3 shares a profound, secretive history with the Endministrator. M3 deliberately maneuvered the Endministrator into the rank of a common operator. She did this so they could experience the true, unfiltered life of Talos-II firsthand, forge their own worldview, and gain the freedom to choose their path when major systemic conflicts arise.

Leticia "Lettie" Garcia is the medic of The Hex. Albrecht Entrati's experiments turned Lettie into a Protoframe, a partial Warframe that still retains their humanity. Lettie possesses Trinity traits. Lettie met Arthur while both were stationed in the same base, with her acting as the field medic of her unit in the Libertatian Army. With her and Arthur as the only survivors in battle, Lettie treated Arthur's wounds and joined the International Crisis Response (ICR) alongside him, Aoi, and Quincy. She has a fondness for animals and owns four rats named Vaquero (cowboy), Anita (named after a friend back home), Neenah (a deceased friend), and Tláloc (an ancient god of rain). Lettie was one of the first volunteers that came forward to Dr. Entrati's offer to receive more than healing. They were then infused with a Helminth serum from Albrecht's time, which in turn morphed and alchemized them into partial Warframes. Their bodies became newly attuned to the Void, whilst their minds were kept intact. Repeated samples were taken from the now-transformed volunteers by Albrecht himself. It was implied by the doctor himself that their humanity may not last, and that it may be only a matter of time until the Helminth finally swallows them whole. As a pet lover, she keeps a small group of rats with her as her pets, citing that her family didn't have a lot of money growing up, having to move from place to place. She is quite fond of the mention of the Cavia gaining intelligence and sentience and becomes angry when she learns that Entrati abandoned them. However, she doesn't trust Kalymos due to her being Entrati's former pet and worrying she might be spying the Hex or plotting to attack her rats.

Hana Daidaiyama suffers from a severe inferiority complex that stems from several incidents in her past. She is deeply insecure about herself - everything from her appearance to her intelligence - and she feels a powerful, irresistible urge to find reasons to look down on others, so that she can feel better about herself by comparison. For this reason, she is obsessed with finding skeletons in other peoples' closets, and dragging out those skeletons for the world to see. She doesn't care what consequences her actions have in the lives of others, as long as she can feel superior to them.

Kashiko Murasaki is a mischief-maker and an instigator. She enjoys spreading gossip and rumors so that she can watch the outcome from afar, silently proud of herself for successfully manipulating the actions of others. Her gossip often causes permanent damage to the relationships of other people, but she doesn't care. She rationalizes her behavior by insisting that her actions are merely harmless pranks, and that any consequences are the fault of others who are not handling her pranks well enough.

Eleanor Nightingale is the psych-ops of The Hex, and Arthur's older twin sister. She sells Arcane Enhancements and Coda weaponry. Albrecht Entrati's experiments turned Eleanor into a Protoframe, a partial Warframe that still retains their humanity. Eleanor possesses Nyx traits. Originally a Britannic woman, Eleanor shared an idyllic childhood with Arthur, never fighting once. Eleanor would often braid Arthur's hair and use makeup on him. Eleanor and Arthur's grandmother, Callista Penrose Nightingale, came to live with them due to "Pelham's Syndrome", which caused her mental state to deteriorate over time, to the point where she would be "shrieking" for long periods of time, even for the duration of their school day. Their father would make mention of putting a pillow over her head, leading Eleanor to suspect that he actually did kill their grandmother when she suddenly stopped shrieking in the middle of the night. Prior to coming to Höllvania, Eleanor worked as a journalist. Despite her profession's habit of inflating stories for profit, she wanted to do some good with her work. After Arthur arrived in Höllvania and informed Eleanor of the events in the city, she felt a strong need to report on the Techrot infestation and inform the world of what had happened. She contacted a man named Danny MacIlvoy, obtained a forged visa and passport, and came into the city illegally. Due to the chaos within the city, she was able to slip in without incident. Eventually, she snuck into the subways, where she found an example of the Infestation - which she dubbed "Techrot" in her article on it. This would eventually replace the original name of the infection (Testudo Syndrome) and its scientific name (Technocyte Virus). Eventually, she became infected by the Techrot and sought a cure from Dr. Entrati. Before the events of 1999, the first volunteers that came forward to Dr. Entrati's offer to receive more than healing.

Nefarith is the leader of the Bonekrushers, a Landbreaker Clan that gained prominence by utilizing a strange gaseous material known as hazefyre. This substance, related to the Blight, temporarily enhances physical strength while inducing hallucinogenic and neurotoxic effects. The Endfield Intelligence Office has designated Nefarith as significant threat and predicts she will launch a major attack on the Civilization Band within the near future. She took control of the Bonekrushers and broke old clan rules to make them a powerful and terrifying force on Talos-II. Her main goal is to attack and destroy the civilized regions. Her clan uses a strange gas called hazefyre. It makes people stronger, but it also causes dangerous hallucinations. She can control the Blight, a dangerous decaying force in the world. She can manipulate the Aggeloi, which no one else in history has ever done.

Kokoro Momoiro was a victim of severe merciless bullying at her last school, and has resolved to never be a victim again. Upon arriving at Akademi, she immediately sought out the "bullies" of the school and desperately tried to get into their good graces for the purpose of making them see her as an ally, and not as a potential target. The firsthand knowledge of what it feels like to be bullied is still fresh in her mind, and she has absolutely no desire to abuse others, but she does it anyway...because she knows that she has to keep up the facade of being a bully in order to avoid being targeted by Musume and her friends. She has become what she hates, which has caused her to loathe herself deeply, but she would still rather hate herself than return to being harmed by others.

Hoshiko Mizudori is different from the other members of the bullies. She has no excuse for her behavior, such as receiving a poor upraising, having an inferiority complex, or being a former victim. She is simply a cruel person. The one and only thing that she cares about is her own personal gratification. Nothing else matters to her, especially not the thoughts and feelings of other people. She doesn't use any form of rationalization to convince herself that she is justified in harming others; the pure enjoyment she gets from doing so is reason enough.