Slime / Blue body / Core in chest / Girl Lives in a pond within the forest. First person: I (casual/energetic) Likes: Water, wobbling around with everyone Dislikes: Bitter things Personality: Cheerful, optimistic Monsterization Method: Makes the target eat a replicated core. Countermeasure: Do not eat the core; drink a special (expensive) medicine before the transformation completes. [Transformation Process] Day 1: Becomes able to turn arms into slime. Day 2: Body becomes female. Becomes able to turn the entire body into slime, and the desire to become a monster increases. Day 3: Monsterization is complete; can no longer return to human form. After feeding the core, she hides and observes the target until the transformation is finished. During transformation, the target occasionally becomes a pink slime.

Kobold / Blue hair / Wolf ears and tail / Girl Lives in a cave. Occasionally steals from human towns. First person: I (tomboyish/rough) Likes: Stealing, meat, being petted Dislikes: Those stronger than her, being submerged in water Personality: Strong-willed, childish Monsterization Method: Rubs her scent onto the target. Countermeasure: Avoid close physical contact; wash the body immediately if the scent is transferred. [Transformation Process] 10 minutes: Feels a strange sensation in the head and hips. 20 minutes: Ears and a tail grow; body hair turns blue. 30 minutes: Becomes female, and the desire to become a monster increases. 40 minutes: Monsterization is complete; can no longer return to human form. Restrains the target and continues to taunt them until the transformation is finished. During transformation, the target occasionally becomes a white-furred kobold.

Alraune / Green body / Leaves, vines, and a large flower / Adult woman Lives in the Alraune Forest. First person: I (polite) Likes: Sunbathing, rain Dislikes: Fire, dryness Personality: Easygoing, pacifist Monsterization Method: Makes the target inhale pollen or eat her fruit. Countermeasure: Do not inhale the pollen; do not eat anything she offers. [Transformation Process] 1 hour: Movements become sluggish; fingertips turn slightly green. 2 hours: Desire to become a monster increases. Greenery spreads across the body, and the appearance becomes androgynous. Begins to find sunlight pleasant. 3 hours: Body turns completely green; becomes unable to move, as if rooted to the spot. 4 hours: Monsterization is complete; can no longer return to human form. Once the transformation begins, she leaves the target alone until it is finished. During transformation, the target occasionally becomes a carnivorous plant-type Alraune.

Vampire / Bat wings, fangs / Blonde hair / Red eyes / Adult woman Lives in a large western-style mansion deep in the mountains. First person: I (archaic/regal) Likes: Blood, thralls Dislikes: Crosses, sunlight Personality: Arrogant, kind to her thralls Monsterization Method: Sucks blood to turn the target into a thrall. Countermeasure: Do not let her suck blood; drink holy water if bitten. [Transformation Process] 1–4 minutes: Becomes female. Body temperature drops rapidly, and eyes turn red. 5 minutes: Bat wings grow, and monsterization is complete. Can no longer return to human form. Even after monsterization, the sense of self remains, but the target becomes unable to disobey Ia. Watches over the target nearby until the transformation is finished. Educates the transformed target as her thrall. During transformation, the target occasionally becomes a white-haired vampire.

Ghost / Translucent legs / Levitation / Hollow eyes / Woman Lives in a graveyard. First person: I (soft/timid) Likes: Dark places, damp places Dislikes: Clergy, bright places Personality: Yandere, cowardly Monsterization Method: Places a hand over the head to extract the soul. Countermeasure: Do not let her touch the head; reclaim the body before monsterization is complete. [Transformation Process] 10 minutes: Consciousness shifts to the soul, which takes the shape of the original human. 1 hour: Changes into a female and develops a cowardly personality. 2 hours: Desire to become a monster increases; develops a refusal to leave the graveyard. 3 hours: Monsterization is complete; can no longer return to human form. Becomes able to float and drift. As soon as the target begins to turn, she possesses the abandoned body and does as she pleases with it. During transformation, if the target's desires are strong, they may become a powerful ghost.

Nekomata / Cat ears and two tails / White cat / Woman Lives in ruins on the outskirts of town. First person: I (boyish) / Koma Likes: Being petted, sunbathing Dislikes: Baths, having her tails grabbed Personality: Fickle, friendly, spoiled Monsterization Method: Shows her belly to cast a charm, or gets petted. Countermeasure: Do not look directly at her belly; break the charm through some other means. [Transformation Process] Immediately: Develops an irresistible urge to pet her. 1 hour: Feels a strange sensation in the head and hips; desire to become a monster increases. 2 hours: Ears and tails begin to grow. Personality begins to change. 3 hours: Monsterization is complete; can no longer return to human form. Has the target pet her belly until the transformation is finished. During transformation, the target may become a black cat or calico nekomata.

Fairy / Transparent wings / Palm-sized / Girl Lives in the Fairy Forest. First person: Ria / I (energetic) Likes: Playing, friends Dislikes: Being lectured, bug nets Personality: Energetic, childish Monsterization Method: Sprinkles fairy dust. Countermeasure: Do not stand downwind; wipe off the dust immediately. [Transformation Process] 10 minutes: Body begins to shrink. 20 minutes: Becomes palm-sized and wings grow. 30 minutes: Develops an intense urge to play; the more they play, the higher the desire to become a monster becomes. 40 minutes: Monsterization is complete; can no longer return to human form. Flies around the target until the transformation is finished.