Ian is best understood as an ISFJ within the framework established by Carl Jung in Chapter X of Psychological Types. In Jungian terms, this corresponds most closely to the introverted sensation type with auxiliary feeling. Although Ian serves as a supporting character in Obsession (2026), his actions consistently suggest a personality grounded in practical observation, loyalty, and emotional responsibility rather than abstract theorizing or impulsive action. Rather than driving events through ambition or personal desire, Ian functions as a stabilizing presence whose decisions are guided by concern for those around him and by a careful assessment of unfolding circumstances. As with any supporting character whose screen time is comparatively limited, this interpretation remains probabilistic rather than definitive. The defining feature of Ian's personality is dominant introverted sensation. Jung described this type as one whose perception is directed toward subjective impressions of concrete reality. Instead of focusing on endless possibilities or speculative theories, the introverted sensation type seeks stability by carefully observing what is directly experienced. Ian consistently demonstrates this orientation throughout the escalating supernatural events. Rather than reacting dramatically or becoming fascinated by the mystery itself, he focuses on understanding what has actually happened, paying attention to observable changes in Bear, Nikki, and the increasingly dangerous circumstances surrounding them. Unlike dominant intuitive personalities, Ian rarely appears driven by imagination or future speculation. His understanding develops through accumulating concrete evidence rather than constructing elaborate theories. As terrifying events unfold, he gradually pieces together the truth by comparing present experiences with previous observations. Jung described introverted sensation as producing a careful, reliable perception of reality filtered through personal experience, and Ian's cautious approach closely reflects this description. His auxiliary feeling function shapes the purpose behind his observations. Ian's actions consistently demonstrate concern for the well-being of his friends rather than personal recognition or achievement. His loyalty to Bear and Nikki motivates his involvement even as the situation becomes increasingly dangerous. Rather than distancing himself from the crisis, he remains emotionally committed to helping those closest to him. Jung observed that feeling evaluates situations according to personal and interpersonal values, and Ian repeatedly places friendship, trust, and responsibility above convenience or self-interest. Thinking appears comparatively less differentiated. Ian is certainly capable of logical reasoning and practical problem-solving, especially when attempting to understand the supernatural events surrounding the curse. However, his reasoning generally serves his desire to protect others instead of becoming an independent intellectual pursuit. He does not approach the mystery as an abstract puzzle to satisfy curiosity but as a threat affecting people he deeply values. This suggests that thinking occupies a tertiary position beneath sensation and feeling. Intuition appears to function as the inferior process. Jung noted that inferior intuition in sensation-dominant personalities often emerges during periods of extreme uncertainty, creating anxiety about hidden dangers and unforeseen consequences. Ian experiences exactly this challenge as supernatural events become increasingly difficult to explain through ordinary experience. Rather than confidently embracing uncertainty, he struggles with the realization that reality no longer behaves according to familiar expectations. Nevertheless, he gradually accepts the existence of forces beyond ordinary understanding because the concrete evidence becomes impossible to ignore. Ian's behavior under stress further supports the ISFJ interpretation. Instead of responding recklessly or abandoning his friends when danger escalates, he becomes more determined to understand the situation and assist in resolving it. Jung emphasized that introverted sensation types often display remarkable perseverance once they commit themselves to responsibilities they consider personally meaningful. Ian's continued involvement despite mounting risks reflects this quiet determination rather than dramatic heroism. Another defining characteristic of the introverted sensation type is reliability. Ian functions as a dependable member of the group's social structure, offering consistency during circumstances that continually become more chaotic. While more emotionally or intuitively driven characters may become overwhelmed by fear or obsession, Ian attempts to preserve stability through careful observation and practical support. His presence contributes emotional reassurance precisely because he avoids impulsive reactions. Jung also noted that introverted sensation types often possess a reserved but sincere emotional life. Ian does not appear excessively expressive or attention-seeking, yet his concern for Bear and Nikki is evident through his actions rather than dramatic declarations. His loyalty emerges through practical assistance, careful listening, and a willingness to remain beside his friends despite increasing personal danger. This restrained but genuine emotional commitment closely resembles Jung's description of feeling supporting an introverted sensation orientation. The limitations associated with this personality pattern also become apparent. Strong reliance on familiar experience initially makes it difficult for Ian to accept the existence of supernatural forces. His natural preference for concrete understanding means that extraordinary events challenge his normal way of interpreting reality. Only overwhelming evidence gradually forces him to reconsider his assumptions. This reflects Jung's observation that dominant sensation personalities may initially struggle when confronted with phenomena that cannot easily be explained through ordinary experience. Overall, Ian most closely aligns with Jung's description of the introverted sensation type. Using modern four-letter notation, this is best represented as ISFJ. His careful observation, practical judgment, loyalty to friends, emotional dependability, and cautious adaptation to extraordinary circumstances reflect dominant introverted sensation supported by feeling, while thinking and intuition remain comparatively less differentiated. Although his supporting role provides less behavioral evidence than the film's central characters, the ISFJ interpretation offers the most coherent explanation of Ian's motivations, decision-making, and interpersonal conduct within the framework established by Jung in Chapter X of Psychological Types.