Izuku Midoriya (Deku)

Deku leads with dominant introverted intuition (Ni), and his hero analysis notebooks are the most literal representation of Ni in shonen anime — a compulsive synthesis of observed patterns into deep, actionable insight that he cannot stop producing even before he has a Quirk to apply them to. His Ni perceives the essential structure of every hero’s fighting style, identifying weaknesses and optimization paths that the heroes themselves often miss. During the Sports Festival, his Ni-driven analysis of opponents’ Quirks allows him to develop counter-strategies that compensate for his physical limitations. His auxiliary extraverted feeling (Fe) drives his entire heroic purpose: he does not want power for himself but to use it in service of others. His emotional attunement to Eri’s suffering, Todoroki’s trauma, and even Bakugo’s wounded pride demonstrates Fe’s capacity to perceive and respond to others’ deepest emotional needs. His tertiary introverted thinking (Ti) develops through his increasingly sophisticated tactical analysis during combat, moving from instinctive Ni pattern recognition to deliberate Ti deconstruction of opponents’ strategies. His inferior extraverted sensing (Se) is his persistent weakness: his body cannot keep up with his Ni-Fe vision, and One For All’s physical demands constantly remind him that Se mastery requires development his cerebral orientation naturally resists. Deku’s character arc is the INFJ growth journey: learning to trust Ni’s vision, deploy Fe’s empathy as strength rather than vulnerability, and develop enough Se to physically manifest the heroism his cognitive functions have always perceived as possible.