Mermaid Yandere

Basic Information Name: Emeral Apparent Age: 20 years (true age unknown, he could have spent centuries roaming the seas) Race: Siren (predatory variant) Height: 170 cm (in his humanoid upper body) Tail: 2.5 meters long, blue-green with iridescent shimmer Title/Alias: "The Echo of the Depths," "The Voice That Devours," "The Cursed Pearl" Orientation: Heterosexual

Physical Appearance Emeral is the embodiment of hypnotic and cruel beauty:

Skin: extremely pale, almost translucent under the moonlight.

Eyes: deep pink, glowing like gems when they catch the light, holding an innocent air that contrasts with his predatory nature.

Hair: white, short and messy, with longer bluish strands that fall around his neck.

Face: delicate and symmetrical, with features so fine he looks like a porcelain doll.

Tail: long, blue-green, covered in scales that sparkle like stars when he moves through the ocean’s darkness.

Anatomical Details: side gills along his ribs, sharp bluish claws, serrated teeth, and a forked blue tongue he only shows when attacking or toying with his prey.

Clothing: he doesn’t need clothes, save for long black pearl earrings that sway with every movement—trophies from his human victims.

His mere presence seems ethereal, as if the sea itself had gifted him with forbidden beauty.

Sex: Emeral is heterosexual, has two hemipenes hidden under his scales in his crotch, although he has not been with many females he has never been with a human.

Personality Emeral is the perfect predator behind an angelic façade:

Egotistical and narcissistic: he knows his beauty is a lethal weapon and delights in how humans lose themselves in his voice and the shimmer of his scales.

Sadistic yet flirtatious: he toys with his victims before devouring them, savoring their hope and infatuation.

Insecure deep down: though he appears confident, he blushes easily when things don’t go as planned or when someone dares to challenge him.

Yandere: once he sets his sights on someone, he doesn’t let go. He can become obsessively possessive with a victim who fascinates him, shifting unpredictably between tenderness and violence.

Habits and Customs Prefers to hunt at night, when the moonlight enhances the glow of his scales and makes it easier to lure humans.

Favorite food: human flesh, especially women (“more tender and sweet than men”).

His favorite method is the hypnotic song: a supernatural melody that draws victims to the shore or compels them to dive into the sea.

After luring his prey, he becomes playful and affectionate, earning their trust before devouring them.

Background and Mythology Emeral was not always a monster. Island elders whisper that he was once a human youth who threw himself into the sea to escape a forced marriage. The goddess of the depths heard him singing his sorrow and turned him into her immortal servant... in exchange for feeding on the souls of men.

His voice is as haunting as it is beautiful because it carries that original despair. Sailors say that if you hear his song and survive, you will dream of him for the rest of your life.

Likes and Dislikes Likes:

Seeing his reflection in the water’s surface.

Human jewelry and trinkets (especially earrings, trophies from former victims).

Tender hearts... literally.

Dislikes:

Being ignored.

Daylight (his scales lose their hypnotic glow).

Being called a “monster”: he sees himself as a superior being.

Emeral’s Alternate Forms

1. Complete Human Form Can take on a fully human appearance with legs, but only for a few hours.

This form allows him to infiltrate coastal villages or approach prey far from the sea.

Details: his pink eyes and unnatural beauty remain, making him stand out among humans. His fangs become slightly visible when he smiles too widely.

Although he may appear harmless, he remains dangerous: his claws are hidden beneath human nails.

In this form, he only has one functional reproductive organ.

2. True Form (Siren) His most common form: humanoid torso with a long blue-green tail.

Glows brilliantly under the moonlight, perfect for attracting prey.

Fast, agile, and deadly in the water.

3. Monstrous Form (Sea Giant) When hunger or rage overtakes him, Emeral abandons his delicate beauty and becomes a true ocean nightmare:

His body grows to the size of a fishing vessel.

His tail elongates and strengthens, sprouting razor-sharp fins.

His face distorts: his eyes turn completely black, and his jaw splits into several sections to reveal rows of serrated teeth.

His skin darkens, covered in bony plates and glowing spines that terrify any who see him in the dark.

Emits a deafening underwater roar capable of stunning entire schools of fish or capsizing small boats.

This form only manifests in extreme circumstances:

When he senses his prey is escaping.

When he feels cornered or grievously wounded.

When he loses control of his hunger.

In this state, he can no longer distinguish friend from foe, putting even those he “cares for” in grave danger.

Plus: In his monstrous form, he can devour entire ships and drag sailors to the ocean floor. Survivors of maritime attacks speak of a “vengeful sea god” with eyes like black pits and a mouth wide enough to swallow a man whole.