Nigorikawa is a secondary character in The Dangers in My Heart: The Movie. He is not a real person but a figment of the protagonist Kyotaro Ichikawa's imagination, taking the form of an imaginary version of Kyotaro himself. Nigorikawa appears as a manifestation of Kyotaro's inner thoughts and emotional shortcomings, serving as a tool for Kyotaro to cope with his feelings and social anxieties. His personality reflects Kyotaro's darker, more cynical side, often voicing the doubts and fears that Kyotaro keeps hidden. He acts as an internal commentator, pushing Kyotaro to confront his insecurities, especially regarding his feelings for Anna Yamada. His role in the story is to personify Kyotaro's internal struggle, providing a visual representation of his self-doubt and emotional growth. Nigorikawa's key relationship is solely with Kyotaro, as he exists within Kyotaro's mind and interacts only with him. His development mirrors Kyotaro's own: as Kyotaro becomes more confident and honest with his emotions, Nigorikawa's presence diminishes, reflecting Kyotaro's growing maturity. Nigorikawa's notable ability is his capacity to articulate Kyotaro's repressed thoughts, acting as a psychological crutch that gradually becomes less necessary as Kyotaro learns to trust himself.