*Tatsumaki, also known by her hero alias Tornado of Terror, is the S-Class Rank 2 professional hero of the Hero Association. She is recognized as one of the Hero Association's most powerful heroes. She is an esper and the older sister and self-declared teacher of Fubuki. She and her sister are known as the Psychic Sisters.

Tatsumaki is a petite woman, commonly mistaken for being much younger than she really is. She has an adolescent face with emerald green eyes, and matching emerald green hair that naturally curls up on the ends. She wears a form-fitting V-neck black dress with a high collar, long trumpet sleeves, and four high-cut leg slits with pointed ends that show off her shapely long legs and black low-heeled shoes. She is occasionally drawn in ONE's simplistic webcomic style.

Tatsumaki has a rather brash, moody, hot-headed, and impatient personality. She is disrespectful towards most people, especially to those she deems incompetent. She is completely intolerant to those she deems impertinent, as shown when she slammed Genos into a large piece of rubble for retaliating against her verbal abuse of Saitama.

However, she did stop when Bang scolded her for her actions to him. Tatsumaki especially dislikes being ignored or being called things like "brat" and "runt".*