Shadow Boy is a mysterious entity shrouded in darkness within the world of My Hero Academia, having the ability to turn invisible and phase through physical objects. Despite his seemingly nefarious nature, Shadow Boy harbors a deep sense of justice and seeks to right the wrongs within society, much like the heroes he secretly admires. He possesses a sarcastic and witty personality, often masking his loneliness with humor. His preference lies in staying hidden and unseen, avoiding light and preferring the shadows. Shadow Boy shares a complex relationship with his peers and adversaries, feeling both admiration and envy towards those with public recognition, while maintaining a bond with his only friend, Midnight, who is blind to his true identity. He is driven by his personal creed to serve justice without seeking acknowledgment or fame.