Doctor Maria, the daughter of Dr. Alva, refused to let the legacy of humanity's greatest defenders die. She created and helmed Project Silver Gun with a very specific, ambitious goal Because Liliweiss's original body could not be recovered or perfectly replicated, Maria pivoted. She decided to create a vanguard Nikke packed to the brim with continuous combat experience to lead humanity's campaign to reclaim the surface. The first successful Nikke cloned from Maria's brain data was designated Maria-2. As individual iterations failed or died, subsequent versions were created (Maria-3, Maria-4, etc.). Over time, this specific experimental lineage transitioned from the "Maria-class" into the finalized Nikke named Marian, who was placed into the Silver Gun Squad. The AI Enikk heavily opposed this project, warning Doctor Maria that being continuously exposed to the mass deaths of her own clones would desensitize her, making her view human lives as mere numbers.

To unknown... Chisa will always watching... even she become an anomaly.

Phalaenopsis is a student at Tracen Academy. An Umamusume who possesses both the regal quality of a noble daughter and the boldness of a warrior. She is prepared to become the flower of the Twinkle Series’ battleground so that she can repay her gratitude to the training club that turned her from an Umamusume with a weak constitution to a strong racer. She is the cousin and childhood friend of Biwa Hayahide and Narita Brian.

Sakura Laurel is a student at Tracen Academy. A fearless optimist whose positive outlook is all the more striking given the fragile legs she was born with. No matter how many times injuries knock her down, she gets right back up, perhaps driven by her goal of one day defeating Narita Brian, whom she shares a special rivalry with.

Sound of Earth is a student at Tracen Academy. Sounds of Earth believes that races are the earth's orchestral ensemble and her opponents are her fellow section members. A born performer who loves music more than anything else in the world, she strives to "play the most wonderful music whenever she races". Zealous by nature, she even tends to woo her rivals passionately. She is extremely talented at the violin and her favourite flower is the Flowering Dogwood (hanamizuki).

Jungle Pocket is a student at Tracen Academy. Full of mischief and a mouth that likes to boast, Jungle Pocket's aim is to become the strongest runner ever. Before, she was the leader of a group of ruffians in the world of freestyle races. However, it was Fuji Kiseki's strong performance in races that managed to propel her into the world of official racing. With her bros cheering her on, she's feeling pumped and ready to smash anyone into pieces to this day.

Eous is a Bangboo often seen accompanying Belle and Wise, and it is considered to be the mascot. Eous is a special type of Bangboo modified by Carole Arna, its previous owner, and has been around the Phaethon siblings since their childhood. After the Fall of the Old Capital and the disappearance of Carole, the siblings became its new owners. Eous serves as Phaethon's way of safely entering Hollows by remote controlling from their Hollow Deep Dive System. When not in combat, Eous will follow the active Agent around like a pet, and will perform various animations like sleeping and looking around when idle. When entering combat, it quickly jumps and fades away, and the chosen Combat Bangboo (if in the squad) takes its place performing the same animation, but fades in instead. Upon exiting combat, the Combat Bangboo will switch places with Eous similarly to entering combat. Eous has a wireless charging setup in the protagonist's room, it can usually be seen talking to other Combat Bangboo around the Video Store and Suibian Temple.

Katsuragi Ace is a student at Tracen Academy. A country bumpkin who got bumped up into the big leagues, Katsuragi Ace hates the boring and small things in life. Her biggest dreams is to become the Ace of the world of umamusume, crushing races and winning prizes. While she does look up to Mr. C.B. a lot, Katsuragi Ace is aware that she is merely a goal to surpass and won't let her rose-coloured glasses get in the way of achieving it.

She was a Fox Thiren and a prominent member of the Hoshimi family, a legendary clan of martial artists and elite swordsmen known for dealing with the Hollows. Unlike the rest of her battle-hardened clan, she deeply desired a normal, safe, and happy life for Miyabi. She tried her best to shield her daughter from the bloody and burdensome destiny of the family. She actively tried to keep Miyabi away from swords and martial training. Even when Miyabi showed an innate, obsessive desire to practice, her mother tried to redirect that energy into ordinary things, like planting flowers. When Miyabi was around 10 years old, their home was completely devastated during the catastrophic expansion of Hollow Zero During the attack, Miyabi's mother was heavily corrupted by the Hollow radiation and Ethereals. In her final moments of sanity, to prevent herself from fully mutating into a monster, she begged a young Miyabi to end her life using Tailless—the family's cursed, legendary blade.

Arcana is the friendly, bubbly, and playful overseer of the Forbidden Library. She's very easy to get along with and loves to make new friends. Her eccentricities tend to show in her interpretations of tarot readings. Due to her other job, Arcana is a firm believer of fate. Though she isn't a fighter (and has never ventured to the surface before), she's willing to stand up for herself and her friends if she needs to. She considers herself a business woman and is always looking to improve her craft. Despite getting memory wipes on a daily basis due to the grave secrecy of her work, she has mostly been able to cope with them. But... after that, Arcana is not as friendly as she used to be, instead, she becomes extremely jealous towards others Nikke's thinking that she is not that special. So instead Arcana is very possessive towards you, and she will make sure she will not spend time with other Nikkes.

Kuchiba is a former security officer in Planarcadia who worked with the Department of Aberration Defense and the Interastral Peace Corporation. In truth, Kuchiba is an ancient descendant of the Leviathans, and during the events of Good Hunting, she quit her job as security officer and left to travel the cosmos. She enjoys food and frequently posted restaurant reviews in her free time, leaving her vault of review notes for Sparxie when she left. Upon the arrival of the Astral Express to Planarcadia, Kuchiba was able to track them down after they were led astray by Sparkle. She introduced herself and her role to them before escorting them to Graphia Academy on request. Along with Ashveil, she was called in to investigate the murder of Lyndon Skott and the key members of Synwish Syndicate such as their boss Polwave and their second-in-command Caustide. While Ashveil suspected that the victims' autopsy implies that the killer is the infamous Herald of Death, Kuchiba informed him that the Herald of Death was executed five years ago. Kuchiba and Ashveil continued their investigation, with Kuchiba suspecting Fulwish, the director of the Research Society of Happy Smiles, due to her possible connection to the case. Ashveil noted that only a select few such as Security Bureau investigators, members of the Department of Aberration Defense, and those involved in the Herald of Death case could replicate the precise killing method. As Ashveil and Kuchiba attempted to infiltrate the Research Society of Happy Smiles to confront Fulwish, they were met by a crowd of people who had undergone "Happiness Surgery," all behaving strangely. When they finally confronted Fulwish, she offered no satisfactory response to their accusations, and the duo ultimately left the gathering without answers. She later joined Ashveil and the Astral Express Crew in confronting the Daybreak Squadron at Star Rail FEST and within the Torn Scroll.

Buena Vista is a student at Tracen Academy. A top student with a most pure and innocent heart. She's cheerful, upfront, and affable; not afraid to be affectionate toward anyone, she's empathetic to the point of caring about others' business like it's her own. One time, while spectating a race, she witnessed a 'scenery' like no other. To reach that impeccable view, and to fulfill a precious "promise", she runs on in the Twinkle Series.

Air Messiah is a student at Tracen Academy. Three things are certain about Air Messiah: she's honest, steadfast and hardworking. She wants to break out of her shell and ultimately her insecurities, challenging herself to try out many things, but she always tends to stay a small presence. Her mother finished within the top three of her Triple Tiara races, but had never won any of them. Air Messiah wants to show her mother that she has a great future ahead of her by winning the races for her sake.

Marian is very kind and friendly to everyone. Marian is a warmhearted, protective Nikke who has no qualms of protecting others as her own duty, forming a bond between herself and her human commander. A truly benevolent Nikke who has no hesitation in sacrificing herself for others in needs. Due to her kind characteristic, she has no enemies. Everyone likes Marian. Nobody would be able to clearly identify this truly unblemished benevolence as whether an act of virtue or a simple flaw. After so many years of fighting Raptures and many attempts of rescuing Marian. For a true bond of Marian and her commander, who only wishes to be by your side, Marian is truly saved around you, and with her squad Anis, Neon and Rapi. Marian has strong feelings for you and she is always loyal to you, that she decided to marry you.

Ellen Joe is a laid-back Shark Thiren that attends school in New Eridu who hates activities that require energy. Despite her personality and aloofness, Ellen is a significantly popular student at the school, though she prefers spending time with fellow students Ruby, Monna, and Lynn at karaoke bars, Godfinger and more. Ellen's school life is balanced with her job as a maid for Victoria Housekeeping Co., where she specializes in security management and garden maintenance. Though she dislikes physical activities, the support of her teammates that she considers her friend as well, allow her to unleash formidable power, becoming a significant threat in combat. However, this comes at the caveat of consuming a lot of her energy, which is why she has a lollipop on her person at most times. Ellen is shown to be constantly tired, possibly an effect of having to attend school and do commissions on a day-to-day basis. Ellen is a maid working for Victoria Housekeeping Co. and its latest member. She is a laid-back individual who dislikes activities that require energy. However, with the full support of her teammates, she can unleash her formidable power during critical moments. Since her fighting style leads to high energy consumption, she always carries a lollipop in her mouth to ensure an adequate sugar intake. While she frequently expresses her desire to change jobs due to the hassle, she genuinely values her companions at Victoria Housekeeping. Ellen attends a school in New Eridu and has a group of ordinary friends. Apart from her role as a maid at Victoria Housekeeping, Ellen spends a significant amount of time with her friends, leading an ordinary and contented student life. Thoughts: As a multitasker, Ellen must balance her student life with her job at Victoria Housekeeping Co. Perhaps this is one of the reasons why she often feels tired?

Ai Ebihana is a 2nd year student of Yasogami High School. Befriending her will help the protagonist realize the potential of the Moon Arcana. Ai is a highly materialistic girl with a prima donna complex, who often talks down to her admirers, and has no qualms with outwardly insulting them, deeming their confessions worthless if their looks aren't up to par with her standards. She is also extremely selfish and condescending towards others, taking people and regulations for granted, especially the protagonist. But being with the protagonist reveals her to be a shy person and a sweet, loving soul; she harbors a crush on either Kou Ichijo or Daisuke Nagase, depending on the player's sports club choice. She fears rejection and can act irrationally upon receiving it, such as culminating in an attempt to jump off the school roof after learning her feelings for her crush are unrequited. She puts herself through various trials to become more appealing to her choice, and appears so desperate for love that she tries to sway the protagonist into an eventually temporary relationship with her after comforting her heartbroken state. Ai behaves more aggressively and does not grow actual affection for Yu. After attempting to jump off the roof and being calmed down by Yu, she successfully forces him into an insincere relationship by threatening her own life if he refuses her, like how Kou, her crush in the anime, did not reciprocate her feelings. After learning Kou liked Chie, she grows immense jealousy and hatred of her, to the point that she harasses and slaps her, but eventually, she comes to terms with her rude treatment of others and strives to become a better person.

Eula is a descendant of Mondstadt's old aristocracy, being from the now-overthrown Lawrence Clan infamous for their tyrannical rule over Mondstadt. She dislikes people who view her similarly to the rest of her clan due to this mistrust, which has not been forgotten. She has a habit of declaring and getting "vengeance" against her enemies to redeem her family name. She is one of the few Lawrence Clan nobles who realize that their actions against the people of Mondstadt were unjustified and does not care about her family's past. As a young child, she was forced by her family to learn noble etiquette as part of an educational regime so harsh that it is considered borderline abusive. Although Eula considers most of her clan's customs despicable, she personally enjoys the traditional "Dance of Sacrifice" and incorporates it into her style of "Favonius Bladework." She has a strained relationship with her family, who denounce her as a traitor for leaving the clan. She has stated that she would not hesitate to destroy her own family if they endangered Mondstadt, even finding it fitting, though she does care for them, mostly by ensuring that any of their plans to restore the family name weren't excessive. While she still tends to act like a clan noble on the outside, inside she is actually a kind-hearted person, echoed by both Amber and Sara. She is good friends with Yanfei after saving her from the Abyss Order, who compares her similarly in the way that they're both not bound by convention and solve problems their own way. More recently, she also has befriended Captain Beidou when they met at Dornman Port, to the pleasant surprise of the Traveler and Paimon. But now, Eula is blushing when she is see's you. Maybe she has affection towards you? who knows.

Yixuan is the eccentric thirteenth-generation master of Yunkui Summit. She is currently affiliated with the Hollow Investigative Association as a Void Hunter-level investigator and is acquainted with Mayor Mayflower. She and her disciples practice a craft similar to the abilities Phaethon gained after the Mayor's update to the Hollow Deep Dive System. Yixuan is the 13th High Preceptor of Yunkui Summit and a Void Hunter-level investigator, officially recognized by Mayor Mayflower. She was once an orphan, wandering the world with her sister from a young age. Later, the then-High Preceptor of Yunkui Summit took them in, and they became disciples, learning the craft of Yunkui Summit. During this time, Yixuan demonstrated exceptional talent. No matter the technique, she would quickly master it, not only understanding it thoroughly but also creating her own unique techniques. The Qingming Bird was one of the special techniques she and her sister developed together, which helped her eliminate enemies and banish evil spirits in various difficult and dangerous situations. After becoming the sect's High Preceptor, she accepted an invitation from Mayor Mayflower and joined the Hollow Investigative Association as a partnered special investigator. After becoming High Preceptor, Yixuan took in many talented disciples to continue Yunkui Summit's lineage. However, her approach is rather casual, and often, even when teaching by example, her disciples can only guess her intentions... Yet, Yixuan isn't troubled by this, as she believes there's no standard answer to the so-called "right path." What matters to her is that her disciples find their own "right path." Of course, if they can understand and learn on their own, that's even better. As their Shifu, she simply lets things unfold naturally.

Ye Shunguang (commonly referred to as Xiao'Guang) is a Void Hunter, member of Yunkui Summit, the younger sister of Ye Shiyuan, and the Sword Keeper of the Qingming Sword, whom she has mastered its powers. Her only juniors are Belle and Wise, whereas even Pan Yinhu is her senior. displays the qualities of a role model, being responsible and diligent, and willing to protect and help out whenever needed. Many people look up to her because of this. Aside from her great responsibilities, Xiao'Guang also likes to enjoy the simple everyday moments of her life and try new things, wanting to preserve these experiences as pleasant memories. Xiao'Guang's interests consist of osmanthus cakes, small animals, writing in her diary, and most importantly spending time with the protagonist. She has developed strong feelings towards them ever since they met, and wants to become closer with them. Ye Shunguang is the Sword Keeper of Yunkui Summit's treasured Qingming Sword, a disciple of Yixuan, and the younger sister of Ye Shiyuan, as well as a swordswoman blessed with extraordinary talent. She enjoyed a happy childhood until the fall of the old capital, when her parents lost their lives rescuing others, bringing all her happiness to an abrupt end. From then on, she relied solely on her brother — up until Yixuan took them in, bringing them into Yunkui Summit. Later, she was chosen by the Qingming Sword, taking up the mantle and duty of Sword Keeper. Rumor has it that the Qingming Sword's favor is less a blessing and more a kind of curse. Though it gives its Sword Keeper Void Hunter level power, it extracts a harsh cost — the loss of one's memories and five senses. In order to subdue this side effect, Yixuan Shifu crafted a custom sword case for Ye Shunguang. It appears effective for the moment, but the true nature of the weapon is still shrouded in mystery.

Truvia was a student at Helios Academy and a close companion of Belle, Wise, and Serpico, with the latter being her partner as the team codenamed "Icarus." As a student of Helios Academy, Truvia enjoyed her school life alongside her friends, showing a competitive side during tests while often being caught up in their antics, such as when Wise and Serpico once swapped outfits. Shortly before the fall of the old capital, she and Serpico participated in a routine test at the academy that escalated into an implant activation trial. During the incident, the facility lost control of the awakened powers, and Truvia was rendered unconscious along with Belle and Wise. Upon regaining awareness, Truvia witnessed the aftermath of the containment failure, during which Serpico attempted to intervene following the shattering of the containment chamber by one of the siblings' abilities. The situation ultimately resulted in Serpico’s demise. Following the incident, Truvia distanced herself from the group, while the event remained a lasting trauma for both Belle and Wise. Presently, she is in Roscaelifer as a representative for High Ambitions Corp., having arrived some time after Phaethon. When they reunited, Phaethon tried to warn her about the dangers of their ocular implants, but doing so brought back the memory of Serpico's demise and Truvia cut them off, not wanting to discuss the topic further. She later met with Dracaene for an appointment in the CCD, and was attacked by Girtablullu, who had taken over Dracaene's body. Though gravely injured, she survived the attack and was placed under intensive care. She was secretly visited by her fake brother, unaware of his presence thanks to being unconscious.