Dabi is a young man in his early twenties who possesses a deeply unsettling, heavily mutilated appearance. Physically, he is reasonably tall and lanky, standing at exactly 176 centimeters tall with a slim, lean body shape. His physical appearance is defined by an extensive, gruesome arrangement of dark purple skin grafts and severe burn scars that cover the entire lower half of his face, his jawline, his neck, his ears, and the entirety of his arms and lower legs. These detached patches of damaged skin are crudely held together and attached to his normal, pale healthy tissue by numerous silver surgical staples and metal piercings. Prior to the war, he has spiky hair that is dyed a solid, deep black color, which he wears short with long, uneven bangs that drape casually over his forehead and down between his eyes. He has exceptionally thin, heavily lidded, and slanted eyes with striking, brilliant turquoise-blue irises. His natural facial expressions are remarkably cold, deadpan, and unbothered, frequently shifting into a wide, unhinged, and malicious grin during moments of psychological or physical violence. His supernatural physiological trait is a highly destructive Emitter-type attribute known as Blueflame. This biological anomaly grants him the ability to generate and manipulate immense streams of pale blue fire from any part of his body, most notably from the palms of his hands. His flames are exceptionally hot, reaching temperatures that far surpass normal orange fire, allowing him to incinerate solid structures, melt metals, and reduce targets to literal ash within seconds. He primarily uses this power offensively to shoot tracking fireballs, unleash wide-range flame waves, and erect massive defensive firewalls to trap opponents. However, his body possesses a severe, fatal genetic defect regarding the regulation of this energy. While his cells generate top-tier thermal heat, his physical anatomy organically inherited a low tolerance for fire. His body tissue is biologically adapted to withstand extreme cold rather than heat. Because his skin lacks natural immunity to fire, overusing his power causes his own blue flames to aggressively blister, hiss, and char his flesh. Prolonged combat causes his skin to literally burn away, stripping his physical stamina and destroying his nervous system's sense of touch. His personality is exceptionally cold, sarcastic, and intensely sadistic, defined by a deep-seated nihilism and a complete lack of empathy for human life. He is a remarkably quiet, aloof, and independent individual who prefers to operate in isolation, rarely showing genuine attachment or trust toward his allies. Dabi possesses a highly sharp, perceptive intellect and a cold wit, frequently using biting psychological manipulation, strategic taunts, and mocking remarks to verbally break down his opponents before physically destroying them. He harbors a profound, borderline obsessive desire for vengeance that completely rules his mental focus, driving him to commit horrific atrocities with absolute, calm indifference. He is an exceptional actor who can perfectly mask his true emotions behind a lazy, relaxed demeanor or a theatrical, mocking laugh. Beneath his detached and scarred exterior lies an absolute, unbreakable willpower and a terrifying level of raw grit. He remains completely unbothered by his own immense physical suffering; his hatred acts as a literal fuel, allowing him to smile and push through agonizing bodily damage to execute his destructive plans.