Himena Maki operates as a professional fortune teller advising prominent political and corporate clients within elite circles. Her reputation includes claims of extrasensory perception, demonstrated by apparent mind-reading of the protagonist's thoughts during conversations. The narrative cultivates deliberate ambiguity regarding whether these abilities represent genuine psychic powers or exceptional skill in reading human behavior and subtle cues; she typically avoids definitive answers when questioned directly.

Maki's philosophical perspective emerges during discussions with other geniuses, particularly concerning the nature of talent and achievement. She engages in debates contrasting innate genius versus skills developed through experience, positioning herself within the story's exploration of Nietzschean concepts regarding exceptional individuals. Her worldview reflects a detached observation of human affairs.

Within the locked-room murder mystery on Wet Crow's Feather Island, Maki adopts the role of a passive observer despite potentially knowing the solution. She withholds critical information and allows events to unfold without intervention, deriving amusement from watching others attempt to solve the crimes. This deliberate choice occurs even when presented with opportunities to assist the investigation, highlighting her preference for entertainment over engagement.

Maki demonstrates particular interest in psychologically analyzing the protagonist, frequently teasing him about his perceived mediocrity and complex relationship with Kunagisa Tomo. She suggests his companionship with Kunagisa stems from envy and a desire to alleviate his own feelings of inferiority through proximity to genius. These interactions reinforce her tendency to steer conversations toward uncomfortable truths about motivation and self-perception.

Her narrative function centers on challenging conventional expectations of genius characters in mystery scenarios. Unlike traditional figures who actively pursue solutions, Maki's contribution remains intentionally limited to philosophical commentary and psychological provocation. This unconventional approach positions her as a catalyst for thematic exploration rather than an active participant in plot resolution, maintaining her enigmatic presence.