Tony Stark / Iron Man — ENTP
Tony is a textbook ENTP: dominant Extraverted Intuition generating endless possibilities, auxiliary Introverted Thinking pressure-testing each one, and tertiary Extraverted Feeling that masks itself as showmanship. Big Five: very high Openness, high Extraversion, mid Conscientiousness (his structure comes from JARVIS, not his calendar), elevated Neuroticism. Enneagram 7w8 — escape boredom by building.
Steve Rogers / Captain America — ISFJ
Steve leads with Introverted Sensing — concrete memories of who he was before the serum anchor every decision — and Extraverted Feeling that protects the group. He is often mistyped as ESTJ because of authority bearing, but his decision-making is values-first, not systems-first. Big Five: high Conscientiousness and Agreeableness, mid Extraversion. Enneagram 1w2.
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Natasha Romanoff / Black Widow — ISTP
Dominant Introverted Thinking (cold, accurate situational analysis) paired with Extraverted Sensing (real-time tactical adaptation). She reads as cool because Fe is her inferior — empathy is present but expressed in actions, not words. Big Five: low Neuroticism in the field, very high Openness to experience, mid Agreeableness. Enneagram 8w9.
Bruce Banner / Hulk — INTP / ISTP split
Banner is an INTP: detached, theory-driven, exploratory. Hulk shifts the cognitive stack toward ISTP-like reactivity — same Ti, but Se takes over and Fe collapses. The duality is essentially what happens when an INTP loses access to their auxiliary Ne and gets flooded by inferior Fe.
Thor — ESFP (evolving to ENFJ)
Early Thor is pure ESFP: present-tense, sensation-led, emotionally expressive. By Ragnarok and Endgame he matures toward ENFJ — Extraverted Feeling moves into the driver's seat as he takes responsibility for his people. A rare on-screen example of cognitive development under loss.
Wanda Maximoff / Scarlet Witch — INFP → INFJ
Wanda starts as INFP — values-driven, emotionally reactive, idealistic. WandaVision and Multiverse of Madness shift her toward INFJ traits: Ni-driven certainty about a single future she will force into being. The arc is a study in how grief can warp Fi into something closer to Ni-Fe inversion.
Loki — INFJ (with ENTP shadow)
Loki is rarely typed correctly. The trickster behaviour is shadow ENTP, but his core is INFJ — long-arc Ni planning, deep Fe attunement weaponised against family, Ti as his check, inferior Se making him crave dramatic moments. His Disney+ arc is essentially an INFJ confronting unhealthy Ni.
Thanos — INTJ
Thanos is the dark mirror of a healthy INTJ: dominant Ni produces an unshakeable vision, Te executes it ruthlessly, Fi quietly justifies the cost (Gamora), inferior Se makes him crave dramatic finality. He is what happens when an INTJ's values collapse into a single optimisation function.
Compatibility patterns in the MCU
Tony (ENTP) and Pepper (ESTJ) work because Pepper's Te-Si provides the structure Tony's Ne-Ti cannot generate. Steve (ISFJ) and Peggy (ESTJ) share Si-Fe vs Te-Si — same values, complementary execution. Wanda and Vision combine INFP idealism with INTJ-like analytical calm. EQIQs models this exact dynamic for real couples using 21 frameworks weighted by relationship context.