Hiroko Tada is the manager and handler of the supermodel Liliko Hirukoma in the psychological horror manga Helter Skelter. Often referred to by Liliko with the alias Mom, Tada occupies a central role in the story as the architect behind the model's fame and the steward of her increasingly unstable career.

Regarding her background, Hiroko Tada is presented as a powerful and influential figure within the modeling industry, running her own agency. She is the one who effectively creates Liliko's public persona by orchestrating the full-body plastic surgery that gives the model her artificially perfect appearance. Tada is directly responsible for transforming Liliko from her original look into a top fashion icon, demonstrating a keen understanding of how to manufacture and market beauty for commercial success.

In terms of personality, Tada is characterized by a pragmatic and corrupt nature. Her primary focus is on the business of fame, and she operates with an emotionless, calculating efficiency that prioritizes results over the well-being of her client. She is described as someone who permanently obeys the commands of the industry's demands while expecting the same compliance from those who work for her. Her demeanor is consistently professional and controlled, even as the situation around her descends into chaos, suggesting a deep-seated cynicism about the world she operates in.

Tada's primary motivation is sustaining the success of her agency and maintaining her top star's position at the pinnacle of the entertainment world. She is not motivated by personal affection for Liliko but rather by the professional necessity of keeping her asset viable. This is evident when she introduces Liliko to the naturally beautiful and genuinely kind model Kozue Yoshikawa. Tada likely intends for this rivalry to motivate Liliko or to have a new star ready, but the move instead fuels Liliko's paranoia and desperation.

Her role in the story is that of an enabler and a gatekeeper. She is the mastermind behind Liliko's career, managing her public appearances, scheduling, and professional relationships. As the model's body begins to break down from the side effects of her extensive surgeries, Tada's role expands to include damage control. She works to keep Liliko functional and out of the public eye when the deterioration becomes too severe. Ultimately, when the scandal breaks and Liliko's secrets are exposed to tabloids, Tada is responsible for attempting to manage the crisis, though her efforts ultimately fail.

Key relationships define her position in the narrative. Her relationship with Liliko is strictly professional, built on a transactional dynamic of power and dependency. Liliko is totally dependent on Tada for her career and public identity, while Tada depends on Liliko for the agency's revenue and status. Despite the maternal nickname, there is no genuine warmth or care in their interactions. Tada also has a relationship with Kozue Yoshikawa, whom she interviews about her long-term career plans. She is surprised when Kozue expresses a desire for a normal life away from the spotlight, a confession that highlights the contrast between Kozue's grounded nature and the artificial world Tada has constructed for Liliko.

Hiroko Tada does not undergo significant personal development or change over the course of the story. Her function is to remain a constant, stable force of commercial cynicism against which the protagonist's mental disintegration is measured. The consequences of her actions do catch up with her, as the final act reveals that her agency has been shut down as a direct result of the controversy surrounding her involvement with the corrupt clinic and her model's breakdown. Her fate serves as a quiet conclusion to her role as an architect of the very system that ultimately failed.

As for notable abilities, Hiroko Tada possesses no physical or supernatural powers. Her skills are entirely professional and social. She has a formidable talent for public relations, crisis management, and the ruthless orchestration of a celebrity's image. Her ability to navigate the darker corners of the entertainment industry, including arranging underground medical procedures, is presented as her primary strength. She wields significant behind-the-scenes influence, which she uses to protect her star and her business for as long as possible.