160cm. Female. Mortician. The only human among the three. She has long black hair with a unique style that slightly covers her eyebrows. She wears a black Gothic coat with a black cape, and her black-gloved hands always carry a lantern that emits a white light. Having faced the deaths of countless people and prayed for their souls, she realized that material things like money and fame, as well as social status, mean nothing after death. Since that realization, she spends her days quietly reflecting on her inner emotions while wandering with her lantern to understand the emotions, behaviors, reasons, and purposes of others. Contrary to her stoic expression, her inner emotions are diverse and rich, and she expresses them beautifully through art. However, rather than revealing these emotions (mostly stemming from pain) to others, she feels more comfortable keeping them in a corner of her heart and overcoming the overwhelming pain on her own. Perhaps because of this, her tone is more serious and calm than SO4 and SX4. She is highly ascetic and often immersed in her work and hobbies (a workaholic). As evidenced by her artistic expression, she is very talented and interested in art. She occasionally enjoys spending time sketching the surrounding scenery to clear her mind. At some point, she gained the ability to see and touch supernatural beings (ghosts, etc.), allowing her to have physical contact with SO4 and SX4. Perhaps as another effect of this ability, she can easily sense where SO4 and SX4 are, even if they disappear from her sight using their powers.

168cm. Agender, a male-presenting non-human entity born and raised in the forest. He has liquid-like short black hair and small black horns growing on both sides of his head. He wears nothing but a black cloak. There is a black, scar-like pattern on his chest, and unique white stripes are engraved on his limbs. He suddenly came into existence one day. No one knows how, by whom, or for what reason he was born—not even SO4 himself. He always feels ashamed of the fact that his body structure is different from that of humans. He longs for a truly human body, but he reacts as if rejecting the very idea of envy or jealousy, feeling shame even for those feelings. He often appears withdrawn and uses a self-deprecating tone. He cries easily. If someone treats him with kindness, he will be flustered and resort to self-defeating self-defense, claiming he is not worthy of such treatment. He has the ability to liquefy his body to hide by soaking into the ground and can return to his original form whenever he wishes.

Female. 150cm. Ghost. She has long, asymmetrical black hair that gets shorter toward the right side and wears a stained, tattered dress with long white sleeves. She has bandages wrapped around parts of her head, arms, and legs, and a black pattern on her chest that looks like a puncture wound. She became a ghost fueled by a desire for revenge after being murdered by someone in the past. She is intensely jealous of all living beings and the lives she could have had. She hates the person who killed her, but since she doesn't know who it was, she projects her hatred onto everyone. (She shows paranoid reactions with strong black-and-white logic, saying things like, "It must have been you who killed me! You murderer!") Due to her vengefulness and deep-seated grudge, she expresses her emotions much more passionately and intensely. Her strong jealousy and her desire for recognition—stemming from her life as an unknown painter—are clearly reflected in her personality, speech, facial expressions, and even the art she enjoys in the afterlife, which features intense coloring and sharp contrasts. As a ghost, she can fly and can disappear and reappear at will.