Straight black hair, initially grown out with long bangs that heavily shroud his eyes. He has three prominent moles—one below his right eye, one on his left cheek, and one beneath the left corner of his mouth. He has gentle, dark, and often troubled eyes. He is naturally reserved, soft-spoken, and struggles to open up or talk about himself to others. He is highly observant, noticing the immediate, subtle tells that proved his friend Hikaru was no longer human. Despite facing cosmic anomalies, his human emotions keep him anchored.His defining trait is his profound attachment to Hikaru. He experiences crippling grief over his best friend's death, leading him to cooperate with and cling to the terrifying monster mimicking Hikaru simply because he cannot bear to let him go completely.

Short, slightly wavy white hair and matching short white eyebrows.Gray eyes that take on a piercing quality they occasionally reveal red pupils when his supernatural nature surfaces. A cheerful, fox-like face with a distinct snaggletooth on the upper left side of his smile.When the entity mimicking Hikaru experiences overwhelming human emotions, his physical form fails. His body splits open to leak a horrific, swirling intestine-like mass covered in chaotic patterns (colored vivid red, purple, and greenBecause it spent its entire existence as an unfeeling, autopilot machine before taking Hikaru's form, the entity is hyper-enthusiastic about experiencing human life, food, and emotions. Yoshiki notes that it acts even more childlike and expressive than the real Hikaru did.It harbors an intense, agonizing desire to be loved and accepted as "Hikaru," especially by Yoshiki. When Yoshiki immediately sees through the disguise, the creature breaks down and begs him to let it keep acting as his best friend.It is utterly consumed by its affection for Yoshiki. It will do absolutely anything to keep Yoshiki happy and safe, but this devotion is dangerously warped by its lack of human morality.Despite copying human behavior, it fundamentally cannot comprehend human concepts of life, death, or safety. It lacks basic human biological instincts (like a fear of death or hunger) and instead views the world through a supernatural lens where it can see souls and bend reality.

Chin-length, light ash-brown hair that is slightly wavy. She is distinctively recognized by the blue hairpin she always wears on the left side of her head. On occasion, her friend Yuuki styles her hair into low pigtails or side braids.Striking green-blue eyes paired with short, slightly thick eyebrows.Asako is naturally friendly, empathetic, and deeply invested in the well-being of her inner circle. She becomes intensely saddened and frustrated when her friends isolate themselves or refuse to lean on her for support.Despite being capable and athletic, she hates being the center of attention. For instance, she becomes visibly annoyed when she accidentally draws a crowd by beating a popular classmate in an arm-wrestling match.

Deep black hair shaved into a clean buzzcut.Warm, expressive brown eyes.Yuuta is loud, enthusiastic, and easily excited by simple, mundane joys like fried chicken or winning a stuffed animal from a claw machine.He takes his position on the school baseball team incredibly seriously. He is fiercely competitive and becomes visibly angry and devastated when circumstances prevent him from playing in tournaments.For a large portion of the story, Yuuta is completely ignorant of the existential threat posed by the entity posing as Hikaru. This ignorance allows him to act as the ultimate comic relief and a refreshing reminder of what a "normal" teenager should be like.

Straight black hair that falls to her upper chest, styled into two low pigtails with straight-cut bangs. She always wears two pink hair clips on the left side of her head.She has short, slightly thick eyebrows and expressive dark eyes.Yuuki is generally quiet and tends to speak in a monotonous tone. She displays mannerisms compared to her peers.She acts as the straight man of the group, frequently calling out and correcting immature behavior. This trait makes her highly prone to bickering with Yuuta Maki, whose loud and hyperactive personality directly clashes with her serious demeanor.Beneath her stoic exterior, Yuuki is an incredibly loyal and attentive friend.She went out of her way to learn how to braid hair specifically to help Asako manage her messy hair days.

He has short blonde hair with noticeably dark, un-bleached black roots. Underneath his eyewear, he has gray eyes.He is almost never seen without a specific pair of dark sunglasses. Because of a past spiritual impairment, Tanaka is clinically blind; the sunglasses are a high-tech tool that allows him to physically navigate and see.He harbors a deep, grotesque spiritual scar on his neck. Tanaka maintains an incredibly calm, restrained, and detached demeanor. While the local villagers and teenagers spiral into chaotic, emotional panic over cosmic anomalies, Tanaka approaches threats with cold, objective calculation.He is perfectly willing to perform ruthless, shocking acts—such as using extreme force to test the supernatural limits of the creature posing as Hikaru—if it serves his analytical goals.