Ken Kaneki's mother was a single parent who raised her son alone following the death of her husband. She worked two jobs in addition to managing the household, a relentless schedule that left her frequently exhausted and unwell. Her life was further complicated by her relationship with her older sister, who constantly demanded money and made excuses for her own needs. Despite the financial strain of supporting herself and her young son, Kaneki's mother consistently provided this support, a decision that contributed significantly to the stress she endured. She ultimately died from overwork when Kaneki was ten years old, after which he went to live with his aunt.

She was a slender woman with short black hair and wore glasses. Her personality was defined by a deep-seated philosophy that a kind person finds happiness by being the one who gets hurt rather than hurting others. She believed that love and kindness were the only requirements for happiness and would not refuse any request for help, treating everyone with equal generosity. This principle guided her actions, including her financial support of her sister at her own expense. Her kindness, however, was perceived by others as a form of weakness, a fear of being alone that drove her to prioritize everyone else's needs over her own well-being and that of her son.

The relationship with her son, Ken Kaneki, is central to her role in the story. While he genuinely loved her, he also harbored a deep, repressed resentment toward her. Her influence on him was profound, as he initially adopted her ideology of self-sacrifice, believing that enduring pain for the sake of others was the right way to live. This belief shaped his early character. However, the reality of their home life was more complex and darker than Kaneki’s initial, idealized memories suggested. Despite her public kindness, she would sometimes physically abuse her son, beating him. In his memories of these moments, a young Kaneki is seen apologizing for his own desires and blaming himself for the mistreatment he received. This abuse created a lasting psychological wound that he suppressed for years.

In the narrative, she appears almost exclusively in flashbacks and the hallucinations within Kaneki’s mind. During the Aogiri Arc, a manifestation of Rize uses memories of Kaneki’s mother to taunt him, pointing out how her philosophy was rooted in weakness and led to her death. This confrontation forces Kaneki to confront his buried resentment, as he angrily berates her for not living for his sake instead of exhausting herself for ungrateful relatives. He later begins to reject her passive, self-sacrificing ideology in favor of making his own decisions. In the sequel, Tokyo Ghoul:re, further explorations of his fractured psyche during the Tsukiyama Extermination Arc reveal more of these repressed memories of childhood beatings, showing the long-term impact of her actions on his mental state. Her legacy is a fundamental source of his internal conflict, shaping his identity, his kindness, and his capacity for violence. No notable abilities of any kind are associated with this character.