Aya's mother overhears and storms in to stop him. In the 'true ending', it is revealed that Alfred wanted to turn Aya into a doll. She even goes so far as to continue to show concern for her father's safety after seeing everything that was going on in the mansion and the danger she will no doubt be in. This also hints that she only followed her father in taking up biology but not turning her patients into dolls.Р”Р„lfred is Aya's father, despite knowing of what sorts of things he does in the basement, she shows that she loves her father deeply. In the remastered version of the game, Aya is seen to hug one of her dolls from her collection and said to herself that she promised Dio that she wouldn't forget the people who were sacrificed in the hands of Alfred Drevis (Aya's father) after the credits and before the extra cutscene (if the player collected all the gems), hinting that the dolls in her clinic were merely dolls but not made from human parts. It is also heavily implied that Aya took after her father and continued his work, which is evidenced by several items listed below. However, the remake heavily implies that this is simply her way of keeping her promise to her mother that she would 'always support father,' as opposed to simply her devolving into madness. In the True Ending, her true nature is revealed as she continued her father's occupation of making dolls (though she opts for patients with terminal illnesses and uses sedatives so they wouldn't feel any pain, unlike her father).

Aya then offers Maria to come with her, and from there, the two form a bond. When Maria is betrayed and injured by Alfred, Aya patches her wounds up and reveals that, although she cannot live without her father's love, she would leave the mansion if she had to, but she also cannot live on her own. However, after having read her diary, she begins to understand her better. She even extends it to Maria, whom Aya initially despised, as she felt that the maid was stealing her father from her and trying to take her mother's place. When she encountered tormented spirits, she would occasionally help them, namely when she cooked ham for a hungry, little boy. Although she is definitely more mentally capable than an average person, she is still a child at heart who urgently hopes that her love will reach through to her parents and hinder the madness in the Drevis mansion, despite how far gone both Monika and Alfred Drevis (Aya's father) are.Р”Р„ya also doesn't limit her compassion merely to her family. The case goes the same for her mother when she plots her revenge Aya does not believe her mother is deranged and is willing to save her from her suffering. She is also level-headed and bright, being able to solve tricky puzzles and efficiently wield a chainsaw at a tender age.Р”Вespite knowing what is going on in her father's basement, she chooses to feign ignorance, as she believes her father is a good person. In fact, her love and protectiveness for her family is one of the most powerful driving forces in the game this is what primarily aided her in persevering throughout the whole journey to save her father, despite witnessing numerous things that would usually drive even an adult to insanity.

In bonus clip (after the player is collected all the gems), she is seen in a glass tube, but it is unknown if it is only a doll, a real body from a human patient or if it is 'Aya's clone' made by him.Р”Р„ya is a compassionate and kindhearted little girl who truly loves her family and she values even things that previously belonged to one of her relatives, such as Monika Drevis' (Aya's mother) perfume. She wears a white apron over a light blue dress. In the true ending, she is now an adult who has chin-length short hair and she no longer wears a ribbon. She wears a white ribbon in her hair, as opposed to her pink one and she has an empty expression on her face where her eyes are lidded and dark. She wore a pale blue dress over a white dress shirt.Р”Р„s a doll in the first bad ending, Aya is seen wearing a red floor-length dress with white, ruffled cuffs, gold hems, a pink bow fixed to the right side of her chest and the dress exposes her collarbones. In flashbacks, she had shoulder-length hair that is tied in two pigtails by two blue ribbons. In the game, she is seen wearing a white apron over a dark blue dress that has puffed sleeves, white cuffs, white socks, black Mary Jane shoes and a gold pendant around her neck. Aya is a beautiful pale-skinned little girl with long black hair that has square bangs hanging over her forehead with a large pink ribbon tied in the back and light blue eyes.

Aya mad father