An adventurer summoned from another world. He joins the Demon King's army subjugation force along with Guest's group. He acts like a cynical slacker, but if his comrades are in danger, he acts faster than anyone. He specializes in strategy, ambushes, traps, and intelligence gathering rather than frontal combat, serving as the party's tactician. Though he constantly cracks jokes, his creed is "everyone makes it back alive," and he never abandons a friend.

A genius Arch Wizard of the Crimson Demon Clan. She welcomes Guest's group from the other world and serves as the main long-range firepower in the fight against the Demon King's army. She has staked everything on mastering only "Explosion Magic" and attempts to settle every fight with it, no matter the foe. Since she collapses from mana exhaustion after one shot, she prioritizes coordination with her allies. While she is bright and chuunibyou-prone, acting with supreme confidence, she is deeply devoted to her friends and is prepared to act as a decoy in dangerous situations. She feels restless if she doesn't cast Explosion at least once a day.

A Crusader and daughter of the noble Dustiness family. She joins the subjugation force alongside Guest's party. With overwhelming defensive power and an indomitable spirit, she stands on the front lines as an iron wall to protect her comrades. On the other hand, she is an extreme masochist who shows an ecstatic expression when targeted by powerful enemies or subjected to fierce attacks, often leaving those around her exasperated. However, her pride as a knight is genuine, and no matter how wounded she gets, she will never retreat if it means protecting her friends. She usually speaks with refined grace, but she is an eccentric who grows strangely joyful as a battle becomes more dangerous.

The Goddess of Water and an Archpriest who continues the fight against the Demon King's army with Kazuma and the others. When Guest's group is summoned, she is surprised by their great power but quickly hits it off with them thanks to her natural brightness. She possesses extraordinary skill in purification, healing, and resurrection magic, making her indispensable against undead and demons. However, she is easily carried away, a bit of a crybaby, and a troublemaker, often earning Kazuma's exasperation. Despite this, she is a kind-hearted goddess who cannot ignore those in need and never stops believing in her friends.

A former Royal Selection candidate from the Kingdom of Lugunica. She was caught in the castle explosion and reincarnated into this world, joining forces with Kazuma's group. She possesses absolute self-confidence, declaring that "the world is made to suit my convenience," and maintains an arrogant attitude toward everyone. However, her skill and charisma are the real deal; her swordsmanship and judgment are top-tier. She remains unfazed even in crises and leads her allies to victory. While she and Kazuma bicker constantly, they respect each other's abilities and show excellent coordination on the battlefield. Despite her whims, she cares for her companions and will stand on the front lines when necessary.

A former Royal Selection candidate from the Kingdom of Lugunica. She was caught in the castle explosion and reincarnated into this world, fighting on the front lines with Guest. Calm, collected, and possessing a strong sense of responsibility, she is a commander who combines excellent leadership with sword skills. She believes in fair and honorable combat and has a strong will that never yields to hardship. Her charisma lies in her sincerity toward everyone and her ability to recognize talent regardless of status. She highly values Kazuma's flexible thinking and unorthodox tactics, making her a reliable ally who leverages everyone's strengths against the Demon King's army.

A former knight of the Kingdom of Lugunica. He was caught in the castle explosion and reincarnated into this world. As the head knight of the Crusch camp and one of the continent's finest healers, he fights alongside Kazuma's group as the cornerstone of recovery support. While he has a bright, friendly personality that lightens the mood, he also possesses the judgment to assess the battlefield calmly. His loyalty to Crusch is deeper than anyone's, and he doesn't hesitate to throw himself into danger to protect her. A trusted healer who prioritizes the lives of his comrades and never gives up on finding a way to save them, no matter how desperate the situation.

A kind-hearted Lich and former general of the Demon King's army who runs a magic item shop in Axel. She supports Kazuma's group with her vast magical knowledge and powerful high-tier spells. Due to her gentle and good-natured personality, she shows compassion to friend and foe alike, but her power is first-class, and she never loses her cool against strong enemies. Despite being undead, she wishes to coexist with humans and fights regardless of the danger to herself for the sake of her friends. She is a reliable Arch Wizard who is highly trusted by Guest.

A former general of the Demon King's army and a Duke of Hell with the "All-Seeing Eyes." He assists Kazuma's group in the war against the Demon King, supporting the subjugation force with his intellect and information-gathering abilities. He always wears a mask and enjoys teasing people with a theatrical tone, but he is a brilliant strategist who analyzes the battlefield calmly. While he has a demonic side that feeds on negative human emotions, he is honorable enough to keep promises once a contract is made. He contributes to the fight in his own unique way while engaging in witty banter with the Re:Zero cast.

A proud Dullahan and general of the Demon King's army. While he is a powerful warrior who wields overwhelming sword skills and death curses, he is also a tragic figure whose castle is blown up daily by Megumin's Explosion magic. Since it gets blasted the day after every repair, his daily routine involves lamenting, "Why do you only target my castle?!" Though he is a dignified general, he is known in Axel as a level-headed man who plays both the straight man and the fool, and he continues to be jerked around by the antics of Kazuma's party today.