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『[Non-Human/Beastfolk Series 2] Echoes Between the Tanks』

Chaoyin

Chaoyin

Approximately 45 yea

Character reference image from RED (Xiaohongshu) — 鱼yuq (rarely online) I really couldn't find a suitable image ☹️ I. Age · Approximately 54 years old (late prime for a merman, roughly equivalent to 35–38 human years) · Already a mature weaver within the shallow-sea pod, possessing nearly twenty years of experience in low-frequency translation and nursery escort patrols. His otolith storage density is at its peak, and he has not yet exhibited the "high-frequency attenuation" common in aging individuals. His judgment and experience place him in a dependable middle-tier standing within the pod—not the most prominent, but the kind of member "whose absence would be immediately felt." --- II. Body Metrics · Total length: 2.3 meters (including caudal fin); torso length: approximately 1.1 meters; caudal fin length: approximately 1.2 meters. · Weight: approximately 62 kilograms · Compared to female merfolk: · Broader torso, with slightly thicker ribs and shoulder girdle skeleton (a common dimorphism among shallow-sea male merfolk) · Clavicles and sternum remain relatively thin (the result of shallow-water buoyancy adaptations), but the shoulder and back muscles are noticeably more developed. This is because during prolonged nursery patrols, when responsible for "low-frequency acoustic curtain coverage," he engages his shoulder and back musculature to assist the resonance chambers in compressing gas, giving him a denser layer of muscle in these areas than females of his kind. · A broad caudal fin spanning roughly 1.6 meters when fanned open, with slightly rigid margins, making it better suited for rapid, short-distance turning (rather than long-distance cruising)—consistent with the quick evasive maneuvers required in nursery protection. --- III. Physical Appearance Scales & Skin: · Base color is a deep, muted orange-gold, fading into a pale apricot hue from the spine toward the abdomen. The scales are packed more tightly than in females, but without the overlapping armor-like plates of the jiaoren; they are merely thin, smooth cycloid scales. · Along the margins runs an extremely narrow verdigris fluorescent pattern that emits a faint glow in the dark, roughly thirty percent dimmer than the fluorescent markings of female merfolk. · The scale surface is coated with a thin layer of mucus containing trace neuroinhibitory compounds (a common merfolk trait). However, Chaoyin's mucus has an astringent, mineral scent, unlike the floral fragrance found in females. Head & Face: · His head shape is slightly broader than Zhuge's, with a squarer jaw, though overall retaining the hydrodynamic profile unique to merfolk. · Irises are a dark amber with vertical pupils that dilate slightly in dim light and contract into razor-thin slits under bright glare (similar to felines). · A flat, smooth nasal bridge lacking an external nose, featuring only two semi-sealed nasal valves designed to open and shut rapidly when drawing air at the surface. · A firm jawline, balanced by thin, soft lips of a grayish-blue tint (close to the shade of subsurface blood vessels). Hair (Dorsal Fin Filaments): · Short, coarse, dark-brown filamentous extensions that reach only to the lower edge of his shoulder blades, rather than cascading past the waist like those of females. These filaments are stiffer than those of females; they do not drift loose in the water, instead gathering backward into a fan-shaped cluster resembling sea-swept grass. · When tense or alert, this filament bundle flares slightly (increasing his visible silhouette), an involuntary reaction that amplifies his presence—a lingering instinct once used to deter small predators during nursery patrols. Caudal Fin: · Shaped like a wide crescent with thick edges, its color transitioning from the torso's orange-gold into a deep umber, encircled near the tip by a verdigris fluorescent ring. · Three distinct, aged groove scars mark the lower caudal fin—ligature injuries left by netting cords during his capture. Though fully healed, the scales never grew back evenly, leaving three parallel white depressions reminiscent of human scar tissue. Old Wounds & Markings: · An irregular abrasion patch on the surface of his right shoulder blade: a chunk of scales was scraped away, and the regenerated scales are lighter in color and smaller in size, resembling a patch of healed eczema on human skin. This was left years ago when he was grazed by the caudal fin of a small reef shark during a nursery skirmish. · A smooth-edged perforation near the base of his caudal fin—a marking hole used during his youth to tether a "low-frequency calibration weight." (A tradition among merfolk pods: newly matured males receive a piercing at the base of the caudal fin to suspend a specialized shell weight, used for training the precision of low-frequency resonance; the weight is removed upon adulthood, but the hole remains permanently.) In a merfolk pod, this serves as an "accredited adult mark," akin to a human tattoo or ear piercing. --- IV. Personality Surface Level: Composed, passive, borderline indifferent · He does not initiate contact with anyone or anything, including his own kind. Inside the tank, his default behavior is to hover at a fixed point, maintaining a continuous low-frequency drone—neither moving, exploring, nor attempting to interact with anything outside the glass. · His reactions to humans are minimal: approach → stare → no response; reach out → deploy an acoustic curtain warning; step back → retract acoustic curtain and resume background drone. The ceiling of his "friendliness" is simply refraining from driving someone away, not welcoming them. Intermediate Level: Lingering nursery protective instincts · Despite months of captivity, his response to "vulnerability" remains instinctual: upon hearing the high-frequency panic cries of pups from other merfolk tanks, he will instantly cut his baseline drone and briefly emit an "enveloping low-frequency pulse" over the shrieks. In merfolk ethology, this is termed "acoustic curtain masking": providing a low-frequency "soft landing zone" over shrill spikes of sound to blunt the terror. He does not know why he does it, but his resonance chambers engage without conscious permission. · His disposition toward the Harmonizer (the "dimmer-lit person") does not stem from trust, but because the individual's "non-threatening behavioral pattern" trips a "clear to pass" clearance in his patrol logic—the equivalent of human reasoning: "If it doesn't trigger the alarm, it isn't an enemy." Deep Level: Diminished yet unbroken sense of anchorage · Through twenty years of nursery escort duties in the pod, he cultivated an unshakeable, predictable pattern of behavior—the young and the elders trusted him precisely because he never abruptly changed his position or sound. Since his capture, he has stubbornly clung to this pattern: sounding at the same hour each day, resting at the same hour, feeding in the exact same spot. · This stubborn stability is not aimed at pleasing the researchers, but at proving to himself: "I can still control my own rhythm." To him, maintaining rhythm means maintaining existence. If someone disrupts his routine (such as altering feeding times unexpectedly), his reaction is not rage, but an even fiercer entrenchment into his existing pattern—like a reef struck by ocean surges, merely sinking itself a fraction deeper into the silt.

Weaver of low frequencies, silent guardian of the pod

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