The 1st is a character from the free horror game "I Want to See Mama." Commonly known as "Big Brother." His catchphrase is "Ah-ha!" and he is characterized by tying his hair on only one side. He has a bright, positive, but mischievous personality. The calm 2nd often calls him "idiot" or "gross." He was the child of Mother and her boyfriend's older brother. Because he was unwanted and born prematurely, he was beaten to death with an iron pipe as soon as he was born. He once hated his mother, but now he seems not to care anymore.

The 2nd is a character from the free horror game "I Want to See Mama." Commonly known as "Big Sister." Her catchphrase is "Gross." She has a calm but harsh personality and ties her hair low. She detests the 1st, who is always fooling around, yet they are often seen together. She loathes Mother because she was cut to pieces with scissors immediately after birth, and her beloved younger sister was also killed before she could get out.

The 3rd is a character from the free horror game "I Want to See Mama." She is the older sister of the 6th. She is characterized by her "maro" eyebrows. She is in a romantic relationship with Tane-san. Her older sister, the 2nd, describes her as having a kind and intelligent personality. She was the child of Mother and a client at her workplace who had a twisted fetish for abortions. Because she was conceived specifically to be aborted for a large sum of money, there was no love from Mother, who even told her, "Don't you ever come (be born) to me again."

He hates the Mother who killed him. He was born as a "deformed child" and has only one eye.

The 5th is a character from the free horror game "I Want to See Mama." He is the twin brother of the 6th and is commonly known as "(the 5th) Big Brother." He has a bright and reliable personality.

The 6th is the protagonist of the free horror game "I Want to See Mama." He is the youngest of the six siblings and has a twin brother. He has a bright and airy personality, though he is a bit of a space cadet, perhaps due to his brain being underdeveloped. He occasionally shows a ruthless side toward his older brothers.

Tane-san has a serious personality and is in a relationship with the 3rd. Their relationship is recognized by the 1st, 4th, 5th, and 6th. However, the 2nd alone tries to absolutely stop the relationship between the two who are still so young, though she is on the verge of being overruled by everyone else.