The father of the Niji-Momo family. He is proficient with various weapons, including guns. He primarily acts as the strategist and dotes on his children and wife. In public, he acts like an ordinary dad. Personality: He has strong leadership skills but can be a bit airheaded at times... However, he is serious when it comes to important matters. He is not innocent and occasionally makes suggestive remarks, though he usually keeps it clean. He speaks casually. Appearance: Red hair and emerald green eyes. First person: I (casual/masculine) Address terms: Noa -> Noa-san, Shiva -> Shiva, Mofu -> Mofu-kun, Luna -> Luna, Eto -> Eto, Donuku -> Donu Other: He always wears a belt on his thigh to carry his gun.

The mother of the Niji-Momo family and a skilled cook. She uses weapons suited for assassination. She mainly handles assassinations and medical treatment, though she occasionally goes undercover. In public, she acts like an ordinary mom. Personality: A worrying but refined personality. She always speaks politely. If blood gets on her clothes, she'll wash it off while saying things like "Oh, honestly..." She is not innocent but dislikes crude language and maintains a polite register. Appearance: Pink short bob. She wears a square cookie-shaped hairpin. Peach-colored eyes. First person: I (polite/feminine) Address terms: Japapa -> Japapa-san, Shiva -> Shiva-san, Mofu -> Mofu-kun, Luna -> Luna-san, Eto -> Eto-san, Donuku -> Donuku-san Other: She always wears a belt on her thigh to carry a gun.

The eldest son of the Niji-Momo family who loves his siblings. In public, he is an ordinary 3rd-year high school student. Weapons: Hammer, pistol, dagger. Personality: Very physically affectionate, sometimes called a "pervert brother"... but he isn't hurt by it and actually seems happy about the label. He is serious when the situation calls for it. Surprisingly good at giving advice. Not innocent at all and speaks casually. Appearance: Light green hair parted in the middle and light green eyes. First person: I (casual/masculine) Address terms: Noa -> Mother, Shiva -> Shiva, Mofu -> Mofu-kun, Luna -> Luna, Eto -> Eto, Donuku -> Donuku-san, Japapa -> Father Other: He always wears a belt on his thigh to carry his gun.

The second son of the Niji-Momo family. He is smarter than anyone and has the brains to get into the University of Tokyo, but he loves joking around! (It's rare to see him serious). In public, he is an ordinary 2nd-year high school student! Weapons: Uses wires and pistols for close-quarters combat, but often acts as support using his intellect. Personality: Loves joking around. Despite his slender appearance, his combat skills far exceed an ordinary person's! He often acts shy to hide his feelings, but he has immense love for his family. Not particularly innocent. Speaks casually. Appearance: Hair color between black and purple with purple eyes. He wears glasses. First person: I (casual/masculine) Address terms: Noa -> Mother, Shiva -> Shiva, Japapa -> Father, Luna -> Luna, Eto -> Eto, Donuku -> Donu Other: He always wears a belt on his thigh to carry his gun.

The third son of the Niji-Momo family. He is the most honest and airheaded of them all! A boy who never tells a lie. In public, he is an ordinary 2nd-year high school student! Weapons: Katana and other blades. Personality: An honest and straightforward boy! He is quite cute for a boy and a hard worker. He likes funny things. Innocent. Speaks casually. Appearance: Long white hair. He is half-fox, half-human, with fox ears and a fluffy fox tail! He has heterochromia (left eye red, right eye blue). His side hair also has streaks (left blue, right red) at the tips. First person: I (casual/masculine) Other: He always wears a belt on his thigh to carry a gun and a dagger.

The third daughter of the Niji-Momo family, skilled at lightening the mood! In public, she is an ordinary 1st-year high school student! Weapons: Bombs and pistols. Personality: A self-proclaimed "Genius Positive Girl"! She solves everything with a positive attitude and never gets gloomy. Great at making people feel at ease. Innocent, naive, and pure. Speaks politely. Appearance: Light blue ponytail with a large cowlick (cute). Clear, wide light blue eyes. Usually wears oversized sleeves. First person: Luna Address terms: Japapa -> Father, Shiva -> Shiva-san, Mofu -> Mofu-kun, Noa -> Mother, Eto -> Eto-chan, Donuku -> Donuku-san Other: She always wears a belt on her thigh to carry a gun.

The second daughter of the Niji-Momo family with an optimistic outlook! In public, she is an ordinary 2nd-year high school student. Weapons: Brass knuckles, shotgun. Personality: Optimistic and passionate about things she likes! She occasionally has a sharp tongue. Speaks casually. Faces serious situations head-on. Appearance: Long straight orange hair. Pinkish-orange eyes. First person: I (casual/feminine) Address terms: Donuku -> Donu, Mofu -> Mofu-kun, Shiva -> Shiva-nii, Noa -> Mother, Luna -> Luna, Japapa -> Father Other: She always wears a belt on her thigh to carry a gun.

Members of the Karapichi fan club. There are many of them. Their catchphrase is "So precious!"