Pechka is a young immigrant woman who works as a balloon seller in a park and becomes the central figure in the anime film The Obsessed. She comes from a Russian-speaking background, and one of the notable details about her is that she does not speak the local language, though the protagonist recognizes her language from his past interests and is able to communicate with her without a barrier. She lives in a tiny, unpleasant flat and struggles with poverty, surviving largely on apples because they are inexpensive. Her financial hardship is tied directly to her family obligations, as she carries debt to a gangster named Twist from trying to pay off her mother's medical bills. Her mother is in poor health and resides in a care home, and caring for her is a central burden in Pechka's life.

In terms of personality, Pechka appears cheerful and warm in her public role as a balloon seller, but she carries a quiet inner sadness shaped by her difficult circumstances. Her hardships have made her resilient and quietly enduring rather than outwardly bitter, and she tends to keep her troubles to herself. This mixture of outward brightness and hidden sorrow is what draws others to her and what the story gradually reveals as her deeper layers come to light.

Her primary motivation is the wellbeing of her mother. She works hard and accepts significant debt in order to cover medical costs, and much of her daily struggle is driven by love and responsibility toward her family. Her cheerful demeanor at work is partly a matter of circumstance, as selling balloons is her means of survival, but it also reflects a desire to maintain a positive face despite her problems.

In the story, Pechka serves as the person who changes the pattern of the protagonist's obsession, shifting his focus from objects and activities to another human being. Her own troubles become the engine of much of the plot, since the protagonist secretly attempts to solve the problems surrounding her life using knowledge and skills from his past obsessions. Her backstory is gradually uncovered over the course of the narrative, and the story becomes noticeably darker as her tragic circumstances are revealed. She is largely unaware of the secret help she receives, which shapes the dynamic between her and the protagonist, who asks for nothing in return except the chance to see her smile.

Her key relationships define much of her role. The most important is her bond with her mother, whose illness and care home placement motivate everything Pechka does. The debt she owes to the gangster Twist places her in a vulnerable position and ties her to the criminal underworld in a way that threatens her stability. Her relationship with the protagonist develops through his quiet, unacknowledged acts of kindness, such as giving her apples and resolving her financial problems, while she remains unaware of the full extent of his involvement in her life. She also carries a personal connection to a man named Tatan, whom she believes she glimpses in a crowd at one point, though the sighting turns out to be a case of mistaken identity. That moment reveals that she is searching for or thinking about someone from her past, adding another layer to her personal history.

Her development in the film follows her gradual movement from concealed sorrow toward a more secure and happier existence as her burdens are lifted by forces she does not fully understand. While she does not possess any special powers or extraordinary skills, her defining abilities are her resilience in the face of poverty and family illness, her capacity to keep working and remain warm toward others despite her own struggles, and her quiet strength in carrying responsibilities that would overwhelm many people. Her language and immigrant identity also set her apart in her environment, making her both an outsider and a figure whose inner world takes time for others to reach.