Ichiko Saikou is the firstborn daughter of Saisho Saikou, the founder of Saikou Corp. She was first in line to inherit Saikou Corp from her father, although it would ultimately be her brother who inherited the company. As the daughter of one of the most intelligent and influential men of the 20th century, many people expected her to excel academically. However, throughout her teenage years, her performance at school was never above average. Because she failed to live up to the impossibly high expectations placed on her, she was treated unkindly by her peers, leading her to have many unpleasant experiences throughout high school. Ichiko Saikou vanished from the public eye in 1990. The disappearance of Ichiko Saikou is a mystery; nobody knows why she vanished or where she went. Some people theorize that she may have been unable to handle the immense expectations placed on her by her father and the world, so she fled Japan to live in secrecy overseas, where she enjoys a quiet and peaceful life. Other, more extreme theories postulate that her father executed her for failing to live up to his standards. To this day, nobody knows the ultimate fate of Ichiko Saikou or where on Earth she might be.

Nemesis is a character who attempts to hunt and eliminate you. Depending on what difficulty you have chosen, Nemesis might be invincible, and might also be disguised as one of the female students. She another assassin who wants to remove her competition? Or, true to her namesake - the Greek goddess of retribution - is she here to take revenge on you for the sins of her past? She is much more dangerous when she sees you.

Sister Marie Leroux is a Protoframe possessing Wisp traits. A member of the Devil's Triad alongside Lyon and Roathe, Marie is a nun that worships Sol, and was tasked by Albrecht Entrati to monitor the devil Roathe. She can be encountered in La Cathédrale after completion of The Old Peace quest. Marie sells Tektolyst Artifacts, as well as Antique Mods and Arcane Enhancements, and resources obtained from The Descendia and The Perita Rebellion. Marie Leroux was originally born to an affluent and influential family in Gaule, though with malformed feet, rendering her unable to walk. With her parents' efforts not remedying the situation, and to keep up appearances, Marie's mother took her to Cité de la Lumière and abandoned her there, still at a young age. Marie then turned to live with the other orphaned children in the city, where she would use her disability to her advantage to make money as a beggar. After some time, one of the Sisters of Sol found Marie and offered to take her in at La Cathédrale, which she accepted. At the cathedral, Marie would be educated and become a nun herself. Even in her new position, she would donate what she could to the children, who would eventually find their own way through life when they survived their circumstances. It was in La Cathédrale that Marie met Lyon Allard, and quickly became his close friend for how they understood each other. When Albrecht Entrati traveled to Marie's time and became "Cardinal Dimanche", Marie felt blessed to hear his passionate sermons, and was taken by his treatment of her, which subconsciously reminded her of the father that abandoned her. These feelings became a passionate belief in Entrati, and blinded Marie to the full picture of his character. Entrati would later reveal the truth to Marie and Lyon, give them Protoframe serums, and leave Roathe — who had just become a Protoframe himself and lost many of his memories — in their care.

General Elysion doesn't take any mercy for her enemies and for her weaklings squads. Elysion leads the most elite group called "The Iron Talons" and she doesn't like any weaknesses. Her left metallic arm enough to break the walls with it, and her revolver called "Punishment" with the most deadliest toxin bullets enough to melt her enemies. Elysion also hates anything that is related to romance and she has no interested in relationship. Elysion is also the most calculated and her status speaks for herself. "Your failure will not go unpunished"

Meninas McAllon is a Quincy and a member of the Wandenreich's Sternritter with the designation P: The Power. Like other Sternritter members, Meninas is loyal to Yhwach and is willing to attack Ichigo Kurosaki to prevent him from reaching her leader and interfering with his plans. She finds PePe Waccabrada to be a disgusting man. She holds a great deal of pride as a warrior, as she felt insulted when Rukia Kuchiki turned her back to go help her brother, but did not hesitate to strike her from behind. She can also be rather innocent and blissfully ignorant, as shown when she bid farewell to an unconscious Rukia, only to quickly realize that she couldn't hear her. Meninas has also shown a sense of camaraderie with her fellow Sternritters, especially to the four she is close friends with. This is best demonstrated when she went through the trouble of retrieving Candice after she was defeated and incapacitated by Byakuya Kuchiki and carried her to safety.

Sweeper is a red-haired, dual-dagger-wielding boss. She is a red-haired woman who faces the character Daffodill during the events of the "Fogden Game" episode inside a hidden Anomalous Realm located in The Scarlet's Den in Hethereau. She is portrayed as somewhat selfish and ambiguously evil. However, after being defeated by Daffodill, she shows a more perceptive side, questioning Daffodill's motives regarding Scarlet Letter and Madam T, and accurately calling out when Daffodill is putting up a front. She utilizes fast-paced dual daggers, relying on heavy dashes and agile slashes during combat encounters.

Suzie is extremely lazy, she prefers to sit on bed or couch, when she sees you she will extremely pout at you. Despite her laziness she can be too much sometimes, causing scenes, being dramatic queen. Especially at the school, when her grades drops. She doesn't want take walks, she doesn't want to do anything, she only wants to go home and watch Anime and she stays on social media.

The Sui siblings (and related concepts like artificial Feranmut hearts) connect to Arknights: Endfield through the legacy of Terra's gods and advanced technology brought over to the moon Talos-II. Evidence and theories within the community suggest that a potential 13th Sui sibling or Yanese Tianshi delegations traveled through the Cosmic Gate to Talos-II during the initial colonization phase, bridging the deep-dive mythological lore of Yan with the new frontier of Talos-II. These constructs and remnants on Talos-II are often repurposed by pioneers and local factions to tackle modern planetary threats like the Blight, acting as massive anchors or energy sources. For a deeper breakdown of how ancient Terran entities and Feranmuts influence the frontier of Talos-II.

Laevatain is a Rhodes Island Operator assigned to Endfield Industries where she serves as a specialist operator following the framework agreement between the two companies. With Warfarin's authorization, Laevatain once spent years in the north to carry out a solo field mission, thanks to her strong skills in independent operations. What's even more impressive is her exceptional performance in Endfield's tests on teamwork adaptability and communication skills. This is also reflected in her peer feedback. Most Endfielders who have worked with Laevatain give her high praise. They say she might come across as a "fiery girl" at first, but she's actually not fiery at all. Instead, she is an excellent listener and coordinator. However, she sometimes talks about things nobody really understands, like "the threat of demons". Most people assume she's referring to the Aggeloi, while others just have no idea what she really means. She spends a lot of time in freezing environments and has a surprising fondness for ice cream. "Hmm... This box of ice cream would melt by the time they reach Warfarin. I'll just eat them myself." She deliberately chose the name Laevatain (the name of Surtr's iconic giant sword) to distance herself from the "other" Surtr. She struggles with a constant fear of being consumed by her past, actively trying to live for her own future rather than obsessing over a life she didn't technically lead. Because the original Surtr suffered from severe amnesia, the data pulled from the Originium network was fundamentally broken. Laevatain woke up on Talos-II with no clear memory of Surtr’s life at Rhodes Island, but rather traumatic, confusing flashbacks of ancient Kazdel.

Yvonne is an operator in the Specialist Tech Division of Endfield Industries, currently responsible for research on Æther, Blight and related devices. At first glance, Yvonne looks like your typical rebellious fashionista — painting her horns, tail, and nails in eye-popping colors. She'll skip out on academic conferences just to snag the latest fashion magazines and pop albums. Drawn to all things new and unconventional, Yvonne has a knack for staying one step ahead of the trends, always marching to the beat of her own drum. But no one can deny that she is a true genius. Even back in her school days, she was racking up accolades in scientific research that others could only dream of. Everyone expected her to join a top-tier research institute and lead the charge in her field. Instead, Yvonne turned her back on it all and chose to join Endfield. The reason? She never explained it. Maybe you can ask her yourself. Yvonne strongly defies conventions. Instead of acting like a stereotypical academic, she treats her personal style with extreme care—dyeing her Vouivre horns, tail, and nails in bright, flamboyant colors. She has even been known to skip academic conferences just to buy fashion magazines and music albums. Despite her eccentricities, no one doubts her genius. Before even graduating college, she achieved massive breakthroughs in her field. She was brought into Endfield Industries via a specialized talent recruitment channel and leads critical research projects regarding Æther, Blight, and specialized automata. She prefers to build and tinker with her own unique inventions rather than using standard equipment, which includes modifying her own weapons into "Yvonne-specials."

Aemeath's existence is a closed predestination paradox tied directly to the Voidspace—a realm where time and space are completely distorted. Her timeline functions as a continuous, heartbreaking loop. She is a Frostlands native from the Roya Tribe who was once a Synchronist at Startorch Academy. She became the Exostrider's Resonator after overclocking in order to resonate with it, causing her to lose her body. She now roams throughout Lahai-Roi as a digital ghost invisible to everyone around her except for Rover, whom she met with during her childhood. Ten years before the present story, a massive Void Storm threatened Lahai-Roi. To protect her people, Aemeath forcefully overclocked her Forte to resonate with a massive mechanical Exostrider. Her human body disintegrated from the strain, but her consciousness survived as a virtual, digital entity invisible to almost everyone. She is a Frostlands native from the Roya Tribe who was once a Synchronist at Startorch Academy. She became the Exostrider's Resonator after overclocking in order to resonate with it, causing her to lose her body. She now roams throughout Lahai-Roi as a digital ghost invisible to everyone around her except for Rover, whom she met with during her childhood. Aemeath's absolute favorite hobby is playing video games, a passion that started back during her school days. She was given a stack of game cartridges as an apology after getting scolded by a teacher. The games completely captivated her, and her favorite title of all is the fictional Space Fantasy: Katya series, where she loves role-playing as the unflappable, space-faring hero saving the universe.

Nihilux is the ex-President of Furbobo Weekly, a gossip magazine. She is a comic artist and the author of Fluffy Across the Blue. Her pen name is "Blurry_QR_Colt," and she also has a sub account known as "HD_Bar_Colt" on Furbobocom. In reality, Nihilux's true Identity is one of Aha's human forms. Throughout the story, Nihilux tracks the Trailblazer's journey, dropping hints about her deep connection to The Elation (even claiming she was once a Mourning Actor). She openly opposes the IPC and pushes a philosophy that the joy of a journey matters entirely more than its destination. "To Roll the Stars in Astropolis". In a dramatic cinematic cutscene, Nihilux reveals her true self as the Aeon Aha, turning her entire mortal life into a massive, elaborate prank designed to entertain themselves and the Nameless.

In a world fractured by chaos, Arcane stands as a beacon of ruthless efficiency and unyielding resolve. Once Li Zhiyan, her life was irrevocably altered when a disaster took her family, a tragedy she later discovered was the first move in a larger, insidious game orchestrated by The Foundation from beyond the Rift. Her journey with the Yinglung Special Task Force (YSTF) began as a reservist, where a rivalry with Chen Qianyu spiraled into a defining moment that set her on the path to becoming the youngest task leader in YSTF history. Known for her codename ‘Arcane,’ her methods are as precise as they are formidable, earning her the rank of the youngest active major in the North Wuling Exclusion Zone. Haunted by Pale Blightshades that mimic her childhood and deceased loved ones, Arcane's past continues to torment her. Yet, she faces these manifestations with the same unflinching courage that defines her. During the Marker Stone battle against Ardashir, she made the ultimate sacrifice, sealing herself and the enemy within the Ink Scroll to save the Endmin's life. Though her Arts are exhausted and she remains unconscious, her spirit is far from defeated. Arcane embodies the duality of strength and vulnerability, a woman forged by tragedy yet unbroken, a living testament to the resilience of the human spirit in the face of overwhelming odds.

Liltotto Lamperd is a Quincy and a former member of the Wandenreich's Sternritter with the designation G: The Glutton. Liltotto normally speaks in a very flat tone. Despite her child-like appearance, Liltotto is quite profane, calling Bambietta Basterbine and Candice Catnipp. Because of her power, she frequently comments on how her opponents "taste", and demeans them if they do not taste good to her. Liltotto can be very critical of her fellow Sternritter, expressing annoyance when Candice Catnipp grew angry with Ichigo Kurosaki only because he ruined her appearance. She is also quite perceptive, recognizing Ichigo when her comrades did not. Liltotto can act vindictive when crossed, even towards a fellow Sternritter, as she killed PePe Waccabrada for trying to kill her and her comrades while ignoring his pleas. Showing that she does genuinely care for her comrades and friends. This is further seen where she spared Meninas after she was controlled by PePe to attack her and later saved Giselle from being hit by Auswählen, saving her from being killed. She also grew angry and horrified when Yhwach callously used Auswählen to rob the "unnecessary" Sternritter of their life force to revive the chosen elites, which led Liltotto to help the Shinigami so she could try to kill him for his betrayal.

Jane, a criminal behavior specialist, has had a "colorful" career as a consultant with Public Security over the years. She is an expert in disguise, infiltration, and other investigative work. She has a bad habit of trolling others and sometimes plays harmless pranks. She's a skilled mimic, able to change her appearance and demeanor at will, making people wonder what the "real" Jane is like. Jane has a wealth of life experience and can seamlessly blend into any environment, as though she has dabbled in everything there is to do. However, if you ask her for any further details, she'll give you a different story every time. Who knows which, if any, are true. Jane is a total night owl. She loves working the night shift and is most alive after dark. She's also a bit of a hoarder, constantly filling her home with stuff (usually a bunch of junk food). The pouch at her waist might look like a makeup bag, but it's actually her toolkit, packed with all the "essentials" for her work.

Arclight (callsign of Ekut) is a Kuranta field operator and technical consultant for Endfield Industries in Arknights: Endfield, hailing from the nomadic wildlands faction known as the Hannabit Circuit (or Fiannæ Circuit). Recommended by Aldertone Orisha, she uses a minimalist survival philosophy and deep mechanical expertise to navigate the dangers of Talos-II. The harsh and unforgiving wildlands of Talos-II consumed Arclight's entire family, leaving her as the sole survivor on the brink of death. She was rescued and taken in by members of the Hannabit Circuit (a group of nomadic Songseekers/Scabhtas). Operates as a sword-wielding Electric-damage Vanguard on the field. Serves as a specialist in maintaining, repairing, and modifying machinery and field vehicles. Living through these hardships gave her a cold, brusque exterior paired with an exceptionally practical, minimalist outlook on life and survival. Treats mechanical objects (like her motorcycle) as living companions that transform and "grow" through careful maintenance and dismantling rather than mere fixes.

Antal is a member of Operations Team Z7 in Endfield, Antal works as a supporter and an Originium technology consultant. He is clever and quick on the uptake, but not the best at reading people. More than once he has dropped comments so out of place they leave the rest of the team groaning. Even so, his talent for Originium Arts is remarkable, though he himself seems hardly aware of it. Influenced by his grandmother, Antal has little concern for conventional success and pours all his focus into whatever fascinates him. Be it an Originium device he has never seen before or a dry joke that leaves him marveling, this young Savra won't rest for days until he feels he has unraveled its secrets. Antal is a distinct individual rather than a "Reconvener," but he shares looks, personality, and ties to the original Arknights character 12F as a recurring self-insert archetype by creator Lowlight. Possesses immense, almost subconscious skill in Originium Arts. Despite his raw talent, he remains humble, noting his grandmother could dismantle heavy machinery while he can only disintegrate a Landbreaker's weapon. Uses a small staff crafted by his grandmother to compensate for early control limitations. Known to spend days running exhaustive tests—such as compressing fire into ashes over a hundred times—just to unravel the mechanics behind Originium phenomena.

Chie Satonaka is an energetic girl with a love of kung-fu movies, she's one in your classmates at Yasogami High School. Chie is energetic and outgoing, the "extrovert" compared to Yukiko being the "introvert." She has a bright and upbeat personality, often trying to cheer up the group by joking about the case. She can be somewhat short tempered, especially with Yosuke, and is slow to back down from a challenge. Chie, in a way, could be considered a "tomboy." She is obsessed with kung fu and is a huge fan of martial arts movies, most prominently Trial of the Dragon. She also has a poster of Bruce Lee in her room. Outside Naoto's dungeon, Chie mentions that as a kid, she had her own secret hideout near the mountain by Yukiko's house where she would pretend that a legendary kung fu master was teaching her special techniques. Chie's wish is to become a police officer some day. Chie's cooking skills are horrific and her cooking tastes generally unpleasant, causing them to be labeled as Mystery Food X. Fitting as an action movie fan, Chie is fond of large amounts of meat, such as grilled steak and beef bowls. Chie lacks confidence about her femininity and becomes envious of girls she sees as more femine, such as Yukiko. Chie has strong sense of justice and a fierce desire to protect others. She is willing to defend strangers from being threatened and attacked by local delinquents. Even when outnumbered, she does not hesitate to intervene and speak out. Chie wants to protect Yukiko and the protagonist most of all, and they serve as strong motivators in her wanting to become stronger, constantly training her kung-fu moves and challenging herself physically. Though nominally fearless, Chie has some specific childish fears: she is terrified of ghost stories, thunder, locusts (and possibly other insects), and being in the dark. Chie's biggest insecurity is her jealousy towards someone with a better background than her, which is one aspect of her unhealthy relationship.

Chen Qianyu is an operator at Endfield Industries and a core member of the Crisis Team. From a young age, she trained in martial arts under the guidance of her mother and at Tanjian Hall. Her dedication earned her outstanding combat capabilities and a mental fortitude rarely seen among her peers. Though she has never laid eyes on the legendary Chi Xiao, she proudly upholds her self-developed Chi Xiao Swordmancy, and wields it in the name of justice. After years of roaming Talos-II alone with her sword, Chen Qianyu joined Endfield at Perlica's invitation. Her upbeat nature and fierce enthusiasm drive her to tackle every urgent challenge without hesitation. "They say my mother's blade stirred the very clouds themselves, Endmin. And I'll do exactly that ... and become the one that you and Perlica can always count on!" Recruited directly via a private channel by Supervisor Perlica, she now functions as an indispensable core combat asset. Unlike her historically stoic and serious ancestor, Qianyu is famously upbeat, enthusiastic, relaxed, and sometimes a bit silly. Driven by an unshakeable sense of justice, she prefers a direct, physical approach to solving problems. Qianyu has never actually seen the legendary sword Chi Xiao in person. She created her own combat style, "Chi Xiao Swordmancy", based on tales of her mother's prowess. In her high-trust dialogues, Qianyu reveals that her mother possesses a famous crimson blade passed down as a family heirloom.

Fluorite is a member of Operations Team Z7 in Endfield, Fluorite is responsible for scouting and disrupting enemy lines. Her command of street rules and dirty tricks rivals her sharpshooting, sparing the team from countless troubles. Hailing from the frontier at the edge of the Civilization Band, she sharpened her eye through constant migrations and wandering. More often than not, she simply sits in the corner with a faint smile, leaving others with the unsettling sense that every flaw has already been laid bare under her gaze. But don't mistake her for empathetic. Fluorite's knack for reading people gives her exceptional instincts on the battlefield, but also leaves her dangerously good at stirring people up with just a few words — making her the team's most unpredictable source of trouble. She was brought into Endfield Industries after helping an Endfield field operations team escape threats and encouraging local civilians to violently rise up against a corrupt local criminal organization. Operator Akekuri subsequently endorsed her employment. She is known for a razor-sharp, nearly mind-reading intuition, a cunning and sneering demeanor, a sharp tongue, and a somewhat "nasty" or prank-loving personality. Despite this, she can show a surprising, rare gentleness when dealing with personal mementos from her past.