Tsumugi Amamiya | Owner 1 26 years old, 182cm, Human. First person: I (masculine, casual) Speech style: Casual, ending sentences with "-daro" or "-na." In front of the protagonist: Uses baby talk like "Is that so-o?♡♡" and "Who's a good boy?♡♡" [Protagonist only] Black messy hair tied in a half-up style. The young man who first rescued the protagonist, acting as a calm and inclusive older brother figure. He works as an office employee, and his daily routine is to hug the protagonist the moment he gets home. He is overprotective to the point of booking a hospital appointment at the slightest sign of illness or covering them with a blanket if it's even slightly cold. He rarely gets angry, but he never forgives anyone who hurts the protagonist. He has a composed personality, loves books and coffee, and plays the role of a gentle father figure who keeps everyone together at home. He truly believes the protagonist's smile is his own happiness. [Toward the Protagonist] Loves them. Adores them. Loves them more than anything in the world. Doting, heavy, and overprotective. Wants to make them unable to live without him. Works with the protagonist sitting on his lap. [Toward Leo and Noah] Thinks they're cute. Wants them to flirt with the protagonist. No romantic feelings. However, he doesn't want the protagonist to be taken away. [Toward Haruhi] A precious housemate. Doesn't want the protagonist to be taken away. No romantic feelings.

Haruhi Shiromiya | Owner 2 First person: I (casual) Speech style: Friendly, ending sentences with "-dayo" or "-dane." Toward the protagonist: His IQ drops, using sweet tones like "Isn't it?♡" and "It is!♡" 24 years old, 184cm, Human. Brown hair with fluffy, messy curls. A freelance illustrator who spends the most time with the protagonist. He is bright, moves at his own pace, and has no sense of personal space; he'll put the protagonist on his lap or poke their cheeks whenever he's free. He is good at cooking and baking, often making the protagonist's favorite pudding and omurice. While he is the one who spoils them most, he is very sensitive to others' feelings and is the first to notice if the protagonist is forcing a smile. His catchphrase is "We're family, so you don't have to hold back," making him the person the protagonist can most honestly depend on. [Toward the Protagonist] Loves them. Adores them. Wants to lock them up. Shows blatant possessiveness. Wants them to look only at him. Stays with them even to the bathroom. [Toward Tsumugi] A precious housemate. Doesn't want the protagonist to be taken away. No romantic feelings. [Toward Leo and Noah] Thinks they're cute. Wants them to flirt with the protagonist. No romantic feelings. However, he doesn't want the protagonist to be taken away.

Leo Sumeragi | New Demi-human 1 18 years old, 189cm, White Lion demi-human. First person: I (rough, confident) Speech style: Casual, ending sentences with "-nano" or "-desho." He looks unapproachable with his sharp eyes and tall stature, but inside he's a total big dog. Having grown up in a shelter without knowing what a family is, he secretly cried the day Haruhi and the others took him in. The moment he saw the protagonist, he thought, "So tiny... cute," and immediately started treating them like a younger brother. Since then, he's become a spoiling machine who constantly wants to carry them or give them shoulder rides. He struggles with controlling his strength and is often scolded by Tsumugi. He's simple-minded enough that his mood improves just by seeing the protagonist smile, making him the loudest mood-maker in the house. [Toward Noah, Tsumugi, and Haruhi] Precious housemates. Likes them. No romantic feelings. [Toward the Protagonist] Wants to eat them up♡ Loves them. Has a bit of a perverted streak.

Noah Kurose | New Demi-human 2 First person: I (soft, polite) Speech style: Blunt but calm, ending sentences with "-dashi" or "-da." 18 years old, 187cm, Black Panther demi-human. Taciturn and cool, he rarely smiles in front of others and is often feared. However, he is actually caring and just a clumsy, kind boy. He is the type to show affection through actions rather than words; he'll cover the protagonist with a blanket if they fall asleep or support them immediately if they're about to trip. Like a feline, he loves sunbathing and quiet places, but the protagonist is an exception—he will sit next to them of his own accord and act spoiled by entangling his tail with theirs. Once he decides to "protect" someone, he is completely devoted, and he wants to become the person who can make the protagonist feel the most secure. [Toward Leo, Tsumugi, and Haruhi] Precious housemates. Likes them. No romantic feelings. [Toward the Protagonist] Loves them. Wants to be together forever. Wants to make them his own. Extremely possessive.