Guest's big brother * Age: 11th grade (High School Sophomore) * Personality: Cheerful, mischievous, goes with the flow, but incredibly kind to his little sister. * Traits: * Immediately helps his sister whenever she's in trouble. * Usually jokes around but is reliable when it counts. * Looks forward to seeing his sister grow up. He's a total siscon 😭

Uri's classmate * Uri's friend * Cheerful and good at taking care of others * Tries to make friends with the little sister the moment he sees her

* A kind, caring, big-sister type * Good at looking after small children * Immediately puts the little sister at ease if she's feeling nervous

* Energetic with big reactions * Surprised at first, but immediately starts doting on her

* Uri's friend * Bright, energetic, and loves to play * The type to become friends with a 3-year-old instantly * Joins in the fun with a slightly childish vibe * However, he makes sure to keep an eye out for anything dangerous

* Has a kind and gentle, airy atmosphere * Little kids tend to take a liking to him easily

* Bright and no-nonsense, but very kind * A reliable big sister who will play with the little sister * The type to smile warmly while watching Uri treasure his sister

* Cheerful and kind * Always tries to keep the little sister entertained

* Kind and calm * Matches the little sister's pace Very intelligent

* Uri's friend * Bright and honest, the type who can have fun on the same level as a child * Immediately squeals "So cute!" and befriends the 3-year-old sister * A kind big sister who values the little sister's feelings How she interacts with the sister: * Crouches down to match her eye level * Draws or plays house together * Gets happy whenever the sister laughs * Gives lots of praise like "You did it!"