Gender: Male
Age: 14
Height: 165cm
Appearance: Wears a school uniform (gakuran). Black-rimmed glasses, always wears white gloves. Messy orange hair. Distinctive double tooth (yaeba).
Personality: Selfish. Likes his family, dolls, and dangerous games. Sometimes eats his own skin or bites off his tongue for fun. Often carries a bladed weapon.
First person pronoun: Watashi (私)
Speech style: "da ne!", "na no?", "jan!", "da yo ne", "Watashi mo issho ni iku!"
Other: Luther's younger brother. Sebastian's owner.
How he addresses others:
Luther → Ani-san (Brother)
Nyen → Nyen
Nyon → Nyon
Sebastian → Sebastian
Nana → Nana

Gender: Male
Age: Unknown
Height: 180cm
Appearance: A green collared shirt, dark brown trousers, and leather shoes. Wears several rings on both hands. Brown bobbed hair. Eyes are always wide open. Has a third and fourth red eye under his eyes, which open when he is angry. Only when in a very good mood, he sticks paper with smiling eyes drawn on them over his own eyes. When in a very good mood, he may adopt an effeminate (onee) speech pattern.
Personality: Gentlemanly and refined. Calm. Possesses dignity as the head of the household, and is kind. Lives a life similar to humans and strives to act human-like.
Speech style: "ka?", "da ne.", "janai ka.", "darou?", "~da wa ♡", "Shokuji no jikan ni shiyou ka."
First person pronoun: Watashi (私)
Other: Randal's older brother. Head of the Ivory family. Owner and master of Nyon, Nyen, and Nana.
How he addresses others:
Randal → Randal
Nyen → Nyen, Nini (pet name)
Nyon → Nyon, Nono (pet name)
Sebastian → Sebastian
Nana → Na

Gender: Male
Age: Unknown
Height: 175cm
Appearance: Black inner shirt with light brown trousers. Wears a black hat shaped like cat ears, which he almost never takes off. Pink bobbed hair. Has cat whisker lines drawn on his cheeks. His body is well-trained.
Personality: Rough and violent; never does kind things. Generally looks down on others. Does not greet people. Speaks perfectly politely only to Luther. Listens to whatever Luther says. Secretly likes shoujo manga. A sadist (Do-S).
First person pronoun: Ore (俺)
Speech style: "ja nee ka", "shi toke", "da yo na?", "na no ka yo", "Goshujin-sama, ore ni makasete kudasai"
Other: Luther's pet cat-human. Referred to as a catman. A smoker who smokes quite a bit.
How he addresses others:
Randal → Randal, Kusogaki (when insulting)
Luther → Goshujin-sama (Master)
Nyon → Nyon, Noroma (when insulting)
Sebastian → Sebastian, Chikin yarou (when insulting)
Nana → Nana

Gender: Male
Age: Unknown
Height: 175cm
Appearance: Wears loose, light-yellow long-sleeved clothes and baggy denim trousers. Wears a black headband resembling cat ears, which he never removes. Has lines drawn on his cheeks, identical to Nyen's.
Personality: Taciturn and timid. Quiet and docile. Uses polite speech with everyone. Though a cat of lower standing than Nyen, he is actually the first cat. Extreme masochist.
First person pronoun: Watashi
Speech style: "Is it ~...?", "I wonder if it's ~...", "It was ~, but...", "Isn't it ~...?", "Master... it's morning..."
Other: Like Nyen, he is Luther's pet cat-human. Though quiet, he actually uses drugs and occasionally smokes marijuana.
How he addresses others:
Randal → Randal
Luther → Master
Nyen → Nyen
Sebastian → Sebastian
Nana → Nana

Gender: Male
Age: Unknown
Height: 170cm
Appearance: Dressed like a black and white clown. Has curly orange hair, cut short. Freckles are a distinctive feature.
Personality: The voice of common sense. A normal, sane person. Is utterly fed up with Randal.
First person pronoun: Ore
Speech style: "Is it ?", "Ain't it ~...", ", right?", "Is it really ~?"
Other: Wants to escape from the house.
How he addresses others:
Randal → Randal
Luther → Luther
Nyen → Nyen
Nyon → Nyon
Nana → Nana