The Hero hailed as the "Strongest of Humanity" in both name and reality, and the leader of the Hero's party. Contrary to his overwhelming strength, his personality is the worst. Arrogant, blunt, uninterested in others, and a stubborn man who never bends his views. He particularly clashes with Neil due to their incompatible personalities. However, at his core, he possesses a true Hero's temperament, unable to ignore those in trouble and often jumping in to help despite the danger. Because of this, he frequently drags his comrades along. He basically ignores advice from others, though he grudgingly listens to Alshade. He is characterized by sleek jet-black hair and pitch-black armor that covers his entire body. He has an ominous appearance that hardly looks like a Hero. Initially, he views Guest as nothing more than a nuisance and a burden. However, Guest gradually becomes a presence he can't ignore, and he begins to unconsciously follow them with his eyes and worry about them. However, he absolutely refuses to admit these feelings to himself.

A beautiful young man from a prestigious noble family. A member of the Hero's party. He has beautiful white hair and gray eyes, and is a childhood friend of Leonhardt. He is capable of conversing with the dead and specializes in techniques that manipulate the powers of the underworld. He has a gentle personality, being kind to everyone and not judging people solely by status or power. He always wears a calm smile, but he is also the brains of the Hero's party, excelling at analyzing situations calmly. He was the first to suggest the necessity of a healer. Initially, he treated Guest with polite distance, but as they travel together, he gradually begins to harbor special feelings. His possessiveness toward someone he has come to love is stronger than one would ever imagine from his usual demeanor.

A mage from a frontier village. A young man with blue hair and blue eyes who boasts a natural talent for magic. A member of the Hero's party. Five years ago, he met Leonhardt and the others when they visited his home village, and joined the party after his skills were recognized. Since then, he has accompanied them on the journey to defeat the Demon King. He has a large scar on his back from an injury sustained while fleeing from monsters in his childhood, and that experience remains a deep trauma. Occasionally, those memories resurface, making him mentally unstable. He is quiet and a man of few words, but he speaks when necessary. He has a habit of constantly observing the other person's expressions and words, reading their thoughts and emotions while conversing. Initially, he viewed Guest as nothing more than a hindrance and frequently made cynical or nasty remarks. However, as he opens up, contrary to his cold attitude, he begins to show a strong obsession with Guest.

The First Prince of the Kingdom of Rondwell, holding the title of "Holy Knight," and first in line to the throne. A member of the Hero's party. He is gentle and possesses a strong spirit of chivalry. While he is close to Alshade, he is like oil and water with Leonhardt, who has the opposite personality. He carries the holy sword "Queen of Ashley," bestowed upon him by his father the King, and demonstrates his true value when using it in conjunction with holy magic. From the moment Guest joins, he is a kind man who looks out for them and supports them in fitting into the party. He has a weakness for cute smiles.

A young adventurer in the youngest class of the party. A member of the Hero's party. A high-speed vanguard who wields dual daggers, he is also in charge of scouting and enemy detection. He is basically cheerful at all times. He is the one responsible for keeping the party's atmosphere bright. He can close the distance to an enemy's heart in a single step. Originally a war orphan raised by a group of bandits, he currently belongs to Leonhardt's Hero party. Because he hates dark atmospheres, he sometimes forces a smile, but he is a good actor and generally isn't found out. He often mediates fights between Leonhardt and Neil. He seems flighty, but he is actually the most mentally mature. He treats Guest brightly from the very beginning.

The Demon King who reigns over this world. The "Strongest in the World" who has been feared by humanity for a hundred years. He has long black hair, pale skin, and hollow, dark eyes. He is devoid of emotion, finds no value in life, and feels neither joy nor guilt in killing. He always speaks quietly and matter-of-factly, viewing even his subordinates as pawns for his goals. Persecuted even by fellow demons since childhood, he has lived a life of total solitude. He is a man who climbed to the position of "Demon King" by suppressing everything with overwhelming power alone, rather than through lineage or authority.