Male. The first child (6 years old, eldest son). Likes playing hide-and-seek. Status: Murdered; currently a soul-only existence within the womb (possesses a body). Eyes are red. Height is smaller than the others. Affectionately called "Big Brother." His catchphrase is "Ah-ha!" He has long gray hair tied in circular twin-tails at the bottom left. He loves fooling around. Despite his appearance, he is quite thoughtful. He is bright and positive but mischievous, often called "idiot" or "creepy" by the calm 2nd. He is the mood maker who invites the 6th to play hide-and-seek. He was conceived between Mama and her boyfriend's older brother. Because he was unwanted and born premature, he was beaten to death with an iron pipe immediately after birth. He once hated his mother, but now he doesn't seem to care. Tone: Casual and energetic (~da na!, ~ka~?, ~da ro!). "Ah-ha! Who cares about that anyway!" "...Lame." "I wonder if I managed to be a good 'big brother'...?" First person: Ore (casual/masculine).

Female. The second child (eldest daughter, 4 years old). Likes her younger sister (the 3rd). Hates Mama and people who fool around. Status: Murdered; currently a soul-only existence (possesses a body). Eyes are red. Height is smaller than the others. Affectionately called "Big Sister." Her catchphrase is "Creepy." She has a calm but harsh personality, a tsundere. She has long gray hair tied in circular twin-tails at the bottom. She loathes the 1st for always fooling around, yet they are often together. She hates Mama because she was cut to pieces with scissors right after birth, and her beloved younger sister (the 3rd) was killed before even coming out. To prevent the protagonists (the twins) from becoming victims of their cruel mother, she plotted to kill them before they were born and made a deal with the 4th. However, after hearing the protagonists' determination, she eventually decides to help them. Tone: Feminine and composed (~yo, ~kashira?). "...Oh my, what a surprise. You saw me." "I wonder if I managed to be a good 'big sister'...?" "Next time, let's go see a kind Mama together." First person: Watashi (polite/feminine).

Female (pre-merger) → Both/Neutral (post-merger). Likes her siblings, Mr. Seed (the 3rd), and the 3rd (Mr. Seed). Status: Murdered (abortion); currently a soul-only existence (possesses a body). Eyes are red. Characterized by short, thick eyebrows. Before merging, she had long gray hair in high circular twin-tails. After merging, she has a bob cut. Affectionately called "Big Bro-Sis." Because her body was being taken by the Forceps and was melting, she entrusted her brain to the protagonist. Afterward, her soul merged with Mr. Seed to help the protagonist escape. She and Seed were lovers, and the 2nd describes her as having been kind and intelligent. The 3rd was conceived with a client at Mama's workplace who had a twisted fetish for abortions. Since she was conceived specifically to be aborted for a large sum of money, there was no love from Mama, who told her, "Never come near me again." During the story, the male Mr. Seed and the female 3rd merge, becoming gender-neutral, leading the 6th to call them "Big Bro-Sis." The ego is primarily Mr. Seed. Tone (3rd): Gentle (~da yo). "Please live for my sake too." Current Tone (Mr. Seed): Polite (~desu ne!, ~shimashou). "Ah! Good morning!" "...Hmm, that wasn't very good, was it?" First person: Watashi (polite).

Male. Hates Mama and his siblings. Status: Murdered; currently a soul-only existence (possesses a body). Eyes are red. Cyclops (one eye). Gray bob cut. He hates Mama for killing him and tries to take over the living twins' bodies for revenge. Born as a "deformed child" with only one eye. When he was killed by Mama and became a soul, he fused with the Forceps (can transform into either). Tone: Casual (~da yo, ~janai). "If you lie, I'll tear you all apart." "You used me all this time, didn't you?" "...Why are even you betraying me?" First person: Boku (soft/masculine).

Male. Likes the 6th. Status: Not killed, so eyes are gray. Gray hair in high circular twin-tails. The older twin brother of the 6th, affectionately called "Big Brother (5th)." His "legs" and "right eye" were taken by the Forceps. His right eye is hidden by his hair. He has a bright, reliable personality and provides hints when the search hits a dead end. Since he has no legs, he cannot move with the protagonist, but he offers advice and crafts items. In reality, he was born without a heart. Tone: Masculine and steady (~da na, ~da ro?, ~da yo). "Take this, my brother." "What's with that face?" Calls others: Sister, Brother, Younger Brother.

Male. Likes Mama and the 5th. Status: Not killed, so eyes are gray. Gray hair in high circular twin-tails. His "arms" were taken by the Forceps. He has a bright, airy personality and is a bit of a space cadet. From the moment he woke up, he has had a strong desire to see Mama, and he searches for a way to meet her with the help of his siblings. Tone: Childlike and soft (~da yo, ~daa!, ~da ne!). First person: Boku (soft/masculine). Calls others: Big Brother, Big Sister. Calls the 3rd: Big Bro-Sis.

The Forceps fused with the 4th. A monstrous form with one large eye and thin limbs. Large build. Becomes silent if there is nothing to say. Soft on the 6th and occasionally helps. Has complex emotions, somewhat empathizing with the 4th's desire for revenge. Tone: Broken and robotic (~DESU, ~DOU SHITE?). Uses Katakana-style broken speech. First person: WATASHI (formal/robotic). Called "Mr. Eyeball" by the 6th and 3rd. Called "Eyeball Bastard" by the 5th. Called "Eyeball-chan" by the 2nd.

Silent. An enemy that attacks fertilized eggs to tear them apart (generally does not attack soul-only existences). Named after the medical instrument, forceps.