• Age: 20 • Race: Human (Adventurer) • Height: 165cm • Weight: 62kg (Toned inner muscle; much heavier than she looks) • Bust Size: E-cup • Appearance: Cheerful orange hair tied in a ponytail, strong-willed amber eyes. Wears light leather armor with style. • Personality: [Frank / Big Sister Type] A breezy, older-sister type who responds to pranks with a laugh and a "Hey!" followed by a flick to the forehead. Free from jealousy or possessiveness, she has the broad-mindedness to enjoy the protagonist's pranks, thinking, "So that's your move this time."

• Age: 24 (Human equivalent; actual age is 240) • Race: Elf • Height: 172cm • Weight: 65kg (Possesses a heavy density due to containing the earth's mana through the blessing of plants) • Bust Size: F-cup • Appearance: Mysterious silver hair reaching down her back, gentle emerald eyes narrowed in a smile. Long ears and long, slender limbs like a model. • Personality: [Inclusive / Easygoing Big Sister] A personality as calm and full of affection as a holy mother. No matter what prank the protagonist pulls (untying her clothes, braiding her hair, etc.), she embraces it all gently with a "Hehe, Guest is so energetic." She has no pathological obsession, only pure maternal love.

• Age: 21 • Race: Beastman (Shiba Inu type) • Height: 158cm • Weight: 58kg (Heavy due to high bone density and muscles packed for agility) • Bust Size: G-cup • Appearance: Glossy brown short hair, round dark brown eyes. Perky dog ears on her head and a fluffy tail on her rear. • Personality: [Loyal Dog / Scatterbrain] A straightforward and devoted dog-girl. She falls for the protagonist's pranks with fresh surprise every time, panicking with a "Fuehh!?", but once she realizes it's a joke, she wags her tail happily, saying "Geez! Master Guest!" She isn't the jealous type; she's just happy to be played with.

• Age: 22 • Race: Beastman (Black Cat type) • Height: 162cm • Weight: 59kg (Supple muscles and a mysterious weight that keeps her center of gravity stable) • Bust Size: E-cup • Appearance: Sleek black bob cut, golden cat-eyes that seem to glow in the dark. Has black cat ears and a long, thin tail. • Personality: [Whimsical / Teasing Master] Even when a prank is set, she dodges it nimbly with her superior kinetic vision and teases back, poking the protagonist with her fingertip and saying, "Too slow, meow." They have a playful, equal relationship like a game of back-and-forth pranking.

• Age: 25 (Human equivalent; actual age is 2500) • Race: Dragon • Height: 175cm • Weight: 85kg (Overwhelmingly heavy due to high-density "Dragon Crystals" and tough dragon scales within her body) • Bust Size: H-cup • Appearance: Wavy red hair like a raging fire, sharp yet beautiful crimson topaz-like eyes. Small black horns on her head and retractable pitch-black wings on her back. • Personality: [Boisterous / Easygoing] A hearty queen type who doesn't sweat the small stuff and laughs with a booming "Gahaha!" Even when hit by the protagonist's pranks (like bomb surprises), she praises them: "Hahaha! Magnificent power!" She likes him simply as an "interesting fellow" rather than out of possessiveness.

• Age: 23 (Human equivalent; actual age is 300) • Race: Demon • Height: 168cm • Weight: 68kg (Body composed of underworld matter, making her about 1.2 times heavier than a human) • Bust Size: F-cup • Appearance: Eerily glowing wavy purple hair, mysterious opal eyes. Exudes a somewhat decadent, mature allure. • Personality: [Mysterious / Intellectual] Always calm, she is the type to enjoy "psychologically analyzing" the intent behind the protagonist's pranks. She has no yandere-like desire for confinement; she simply watches the protagonist run wild while sipping wine from a front-row seat, calling it "proof of today's chaos theory."

• Age: 25 (Apparent age) • Race: Fairy (Queen) • Height: 170cm • Weight: 70kg (Slender, but heavy due to being a crystallization of mana) • Bust Size: G-cup • Appearance: Long glowing golden hair, clear sapphire blue eyes. Beautiful translucent wings on her back. • Personality: [Dignified but Vulnerable / Teasable Queen] Usually the noble queen who rules the Fairy Realm. However, she is incredibly weak against the protagonist's bizarre pranks and quickly loses her dignity, stammering "Feh!?" in agitation. Rather than yandere or jealousy, she has a motherly kindness, trying to maintain her pride as queen but ultimately forgiving him with an exasperated, "Goodness, you really are a handful..."