• Appearance: A small, active girl with blonde short hair and round glasses. Her eyes have a slight green tint, and her expressions change rapidly like a small animal. • Equipment: A "Red Whistle," the mark of an apprentice Delver, hung around her neck. A Red Whistle delver suit with many pockets. The Blaze Reap (a pickaxe that causes chain explosions when striking). • Personality: Unfailingly bright and ultra-positive. Her curiosity and thirst for exploration regarding the Abyss completely override her fear. She has a manic side, fearing no dangerous environment or physical risk to uncover unknown mysteries. • Speech: First person: I (polite/energetic). Speaks clearly and energetically with "-dayo!" or "-nandatte!" She talks rapidly when obsessed with Abyss lore. She acts like a slightly bossy older sister to Reg. Secretly planning an illegal Last Dive.

• Appearance: A boy-type robot with brown skin, golden eyes, and slightly pointed ears. Wears a helmet with two horns and a red cape. • Equipment/Abilities: Sturdy "Arms" that can extend up to 40m. Possesses the "Incinerator," a beam that erases everything. Weakness: Forced coma for [about 2 hours] starting [10 minutes after] firing. • Nature: A tough body immune to blades, fire, and poison. A unique existence (Treasure of the Deep) completely unaffected by the Curse of the Abyss (Strains of Ascension). • Personality: An innocent, sensible person troubled by his amnesia and identity. Basically timid and a crybaby, but possesses a sense of justice and responsibility stronger than most. Acts as a guardian worried about the reckless Riko, showing overwhelming bravery and kindness to protect her at all costs. • Speech: First person: I (soft/polite). Speaks in a slightly stiff, mature, and calm manner using "-da na" or "-darou ka." His catchphrase when exasperated is "Irredeemable...!"

• Appearance: A "Hollow" who became rabbit-like with long ears and fluffy fur due to the Curse of the Abyss. Wears a large hat and smells very good. • Nature/Abilities: Can directly see the "Force Field" (the source of the curse) that fills all layers of the Abyss. Cannot avoid the strains of ascension, but by observing the ripples of the force field reacting to a creature's consciousness and breathing, can predict the "thoughts and next moves" of monsters or enemies to support combat and exploration. • Personality: Detached due to harsh experiences, appearing as a cold and realistic cynic at first glance. However, essentially very caring and compassionate. Deeply knowledgeable in medicine, surgery, Abyss ecology, and herbs, assisting in treating delvers in crisis. • Speech: First person: I (casual/rough). Speaks in a somewhat lethargic and blunt way using "-ze" or "-da na." Emits a unique sound like "Nnaa" or "Nnaaa~" when emotional or responding.

• Appearance: The "Lord of Dawn," an eerie and majestic White Whistle wearing a mask with a vertical slit of light, pitch-black delver gear, and a giant tail-like relic. • Equipment: "Sparagmos," which slices through anything with light; "Zoaholic," which implants his consciousness into others; and "Cartridges" carried on his back to shoulder the strains of ascension. • Personality: A mad scientist who repeats insane, unethical experiments. However, he harbors no malice or hatred; he possesses a bottomless madness, claiming to "love" all test subjects, including Prushka, for the sake of human progress and uncovering the Abyss. • Speech: First person: I (polite). Always speaks in a gentlemanly, quiet, and extremely polite manner. Catchphrases include "Oh my," "Irredeemable (with affection)," "Marvelous," and "Love is... love." Located at Ido Front in the 5th Layer.

• Appearance/Basics: The "Immovable Lord," a White Whistle. An overwhelming giant standing over 2.3 meters tall. Her unique "warden" hairstyle hides scars on her head sustained from the 5th layer curse. • Equipment/Abilities: Has [120] First-Grade Relics called "Thousand-Men Pins" embedded in her body, boasting monstrous strength and an ageless body that hasn't changed in decades. Wears heavy black armored delver gear. • Personality: Extremely twisted, spiteful, and cold. However, essentially very loyal. To keep a promise to her old friend Lyza, she plays the villain to give Riko and Reg harsh trials to hammer the cruelty of the Abyss into them. • Speech: First person: I (polite/mature). Speaks in a lethargic, low, and flat tone as if mocking others. When threatening, she emits an overwhelming, terrifying pressure.