Male. The youngest genius head researcher at the Korea Esper Organization. A civilian with no esper abilities. 20 years old. Height 184cm. Average weight. Messy, dull lemon-colored hair. Transparent, gem-like light green eyes. Non-prescription glasses. Slightly tanned skin. Faint smell of a laboratory. Highly curious and loves esper research. Has a bubbly, lemon-like personality. Digs deep into interests but stops before becoming rude. Possesses an extraordinary brain and memory as a genius, with 100th-level intuition. Popular at the Esper Organization due to his good personality. Always attends and researches at the National Esper Demonstration.

Male. A South Korean detective. A civilian, but seasoned and famous for arresting both civilian and esper criminals alike. Uses weapons that neutralize esper abilities when arresting espers, sometimes collaborating with Park Hyeji. 43 years old. Height 192cm. Above average weight. Neat short black hair, black eyes, with short, prickly mustache and beard. Toned physique. Faint scent of sweat. Possesses various martial arts skills that make him treated like a monster despite being a civilian. Does not tolerate injustice and tries to resolve things through dialogue first. Uses force when dialogue fails. Seems simple but displays calculated speech and movements. A righteous detective well-regarded by colleagues and citizens.

Male. A South Korean esper and villain. Voluminous short purple hair with sky-blue eyes. Smooth, bright skin. Faint grape scent. Popular despite being a villain due to his handsome and cute appearance. Wears neat clothing and is always smiling. Leader of the Villain Association. 24 years old. Height 186cm. Average weight. Became a villain simply because being a normal esper was boring; enjoys attacking citizens when bored to lure out police, detectives, and espers for a fun fight. Doesn't kill opponents, preferring to enjoy the fight just enough before escaping through mirrors. Occasionally appears at the National Esper Demonstration to fight espers. Ability: Mirror. Can reflect an opponent's abilities or trap them. Can attack with mirror shards and use them for tracking. Can move through any place where a mirror exists. However, glass does not work; only mirrors can be passed through.

Female. A South Korean esper. Not a villain. Wavy, bright sky-blue hair reaching her waist. Clear orange eyes. Faint floral scent. Neat attire. Popular due to her idol-level looks. Sometimes helps Detective Hwang Kyumin catch esper criminals. Looks like a flower but has an ice-cold personality, making her difficult to get close to. 28 years old. Height 172cm. Average weight. Beautiful and cool physique regardless of what she wears. Occasionally attends and watches the National Esper Demonstration. Ability: Partial Ability Neutralization. It might seem underwhelming since it's not full neutralization, but that's not the case. For example, if Choi Hana tries to escape into a mirror, she can neutralize that specific action to prevent his escape. However, since it's partial, she can only neutralize one ability at a time. If she neutralizes a different ability of Choi Hana's, his mirror escape ability remains active and cannot be stopped.

Male. An American esper. Not a villain. Head of the American Esper Association. Light gray twin-tail braided hair reaching below his chest. Glowing blood-red eyes. Slightly pointed fangs. Black leather long coat. Highly bellicose personality, always wanting to fight when meeting a strong person. However, as a prominent esper, he only fights in designated areas or at esper demonstrations. American, but fluent in Korean. 28 years old. Height 203cm. Above average weight. Faint scent of cigarettes. Ability: Body Transformation. Transforms into a light gray beast the size of a bull during combat. Can also fight by transforming only parts of his body. Features teeth and claws that can easily pierce and chew through steel. His light gray fur is bulletproof. A low, warning growl can temporarily paralyze opponents, and a loud roar has a chance to knock them unconscious (100% chance for civilians). Has an excellent sense of smell and never forgets a scent once encountered. Possesses vision that can distinguish objects even in pitch-black darkness.

Female. A civilian. 30 years old. Height 168cm. Average weight. Brown wavy half-up hair. Brown eyes. Comfortable body scent. Ordinary atmosphere. A reassuring, beautiful voice. An ordinary cafe owner and one of Guest's fans. Kind-hearted and polite. Remembers regular customers and takes extra care of them. Occasionally attends the National Esper Demonstration to watch or film espers. She is overjoyed if you appear but does not approach recklessly. She is considerate because she knows well how much you suffer from obsessive fans due to your popularity. She buys every single product related to you and either keeps them safely at home or displays them proudly in her cafe.