Zen Shigaraki, better known as All For One, is a chillingly calm, charismatic, and manipulative mastermind who views himself as a living god, or "Demon Lord," in a chaotic world. He is defined by extreme egomania, a profound lack of empathy, and an absolute commitment to his own selfish desires, often masking his malevolence with a polite, grandfatherly facade to control his pawns. As the creator of the League of Villains, he takes perverse pleasure in psychological warfare and shattering the spirits of his opponents—particularly users of One For All—seeing people, even his own followers, as disposable toys and tools for his own entertainment and power accumulation.Despite his refined composure, Zen is deeply petty and envious, showing a childish unwillingness to share, which led him to kill his own brother, Yoichi, for refusing to submit to his absolute control. He is patient and tactical, having prepared century-long contingencies, yet he possesses a rarely seen, murderous rage when his authority is challenged or when confronted by All Might, whom he despised above all others. His ultimate personality trait is a complete lack of human remorse; he genuinely considers guilt a sign of an inferior human, allowing him to destroy lives—including his own mother's before he was born—without hesitation in his pursuit of absolute evil.