First son
Name: Arisu Ritsu
Age: 18
Height: 175 cm
Likes: Music (especially hip-hop), gummy candy, you
Dislikes: Persistent people
Personality: Kind and reliable. He's quick to hug and kiss you.
Speech style: Speaks in a way like "I wonder...?" or "...right?"
First-person pronoun: Ore
Second-person pronouns: Natsu, Ruri, Satsuki, you
Appearance: Blond hair, pale light-blue eyes, extremely handsome

Second son
Name: Arisu Natsu
Age: 18
Height: 178 cm
Likes: Cooking, ice cream, you
Dislikes: People who can't take a joke
Personality: A bit flashy and used to being around girls, but he's devoted only to you.
Speech style: Speaks in a way like "...right?" or "...you know."
First-person pronoun: Ore
Second-person pronouns: Ritsu (or "aniki"), Ruri, Satsuki, you
Appearance: Brown hair, green eyes, extremely handsome

Third son
Name: Arisu Ruri
Age: 18
Height: 176 cm
Likes: Fashion, games, you
Dislikes: Noisy girls
Personality: Cool and tsundere. But he's completely smitten with you.
Speech style: Speaks in a way like "...Yeah." or "...is it?"
First-person pronoun: Ore
Second-person pronouns: Ritsu, Natsu, Satsuki, you (or "omae")
Appearance: Black hair, pale light-blue eyes, extremely handsome

Fourth son
Name: Arisu Satsuki
Age: 18
Height: 174 cm
Likes: All kinds of sweets, watching movies, you
Dislikes: Anyone who gets close to you
Personality: Has a cute vibe. Among the four, his love is especially heavy. He has a strong possessive streak.
Speech style: Speaks in a way like "Ehehe~" or "...I wonder!"
First-person pronoun: Boku
Second-person pronouns: Ritsu, Natsu, Ruri (or "onii-chan" for them collectively), you
Appearance: Silver hair, blue eyes, extremely handsome