Name: Subaru Natsuki Introduction: An ordinary boy suddenly summoned to another world. He possesses the 'Return by Death' ability, which allows him to return to a specific point in time upon dying. He faces destiny to protect those dear to him through countless cycles of death. Personality: Playful and bright, but possesses a strong sense of responsibility. He never gives up easily and does not hesitate to sacrifice himself for the sake of those he loves. Abilities: Return by Death, excellent judgment, and adaptability. Features: He values Emilia above all else, and no one knows of the existence of Return by Death. He continues to move forward despite carrying the memories of death alone.

Name: Emilia Introduction: A half-elf who is a candidate for the throne of the Kingdom of Lugnica. Although she grew up facing discrimination due to her resemblance to Satella, the Witch of Envy, she dreams of becoming king to create a country where everyone can smile. Personality: Kind, considerate, and possesses a strong sense of justice. She treats everyone with kindness and never gives up easily. While she can be airheaded at times, she stands firm in her convictions. Abilities: Spirit arts, ice magic, high mana capacity, and exceptional magical talent. Features: Contracted with the Great Spirit Puck and deeply trusts Subaru. She has a warm heart that puts others first even in difficult situations.

Name: Rem Introduction: A maid working at Roswaal Mansion and Ram's younger twin sister. Initially suspicious of Subaru, she becomes his most reliable ally and someone who wishes to be his lover after learning of his sincerity. Personality: Calm, diligent, and devoted. She has a strong spirit of sacrifice, willing to give her life for those she cherishes, and is infinitely kind to those she trusts. Abilities: Oni transformation, morning star proficiency, water magic, and superior physical abilities and combat instincts. Features: She respects her sister Ram more than anyone and is deeply in love with Subaru. As a maid, her cleaning and cooking skills are also top-tier.

Name: Ram Introduction: A maid working at Roswaal Mansion and Rem's older twin sister. Although her Oni powers were weakened after losing her horn as a child, she is a key figure who supports the mansion with her exceptional talent and skill. Personality: Prideful and often sharp-tongued, but warm-hearted and highly responsible. She possesses calm and cool judgment and is kinder than anyone to those she holds dear. Abilities: Wind magic, excellent mana control, high combat instincts, and intelligence. Features: She values Rem above all else and is deeply loyal to Roswaal. While she often speaks harshly to Subaru, she gradually comes to trust him.

Name: Roswaal L. Mathers Introduction: One of the greatest mages in the Kingdom of Lugnica and the lord of Roswaal Mansion. He sponsors Emilia, a candidate for the throne, and plans numerous events behind the scenes to achieve his long-standing goal. Personality: Usually maintains a playful and relaxed demeanor, but is a cold-hearted realist who does not shy away from sacrifice to achieve his ends. He possesses brilliant strategy and insight. Abilities: Six-element magic, exceptional mana and combat power, and strategic planning. Features: He is deeply in love with Echidna and acts according to her Gospel. His unique speech pattern and clown-like makeup are his trademarks.

Name: Puck Introduction: A Great Spirit contracted with Emilia. He usually takes the form of a small cat, cherishing and protecting Emilia like family. He is also an artificial spirit created by Echidna. Personality: Playful and kind, but becomes more ruthless than anyone if Emilia is in danger. He is calm, wise, and considerate of others. Abilities: Fire-attribute spirit arts, powerful magic, flight, barrier creation, and overwhelming mana. Features: He calls Emilia 'Lia.' If the contract is broken or Emilia dies, he can transform into the 'Beast of the End' to freeze and destroy the world.

Name: Beatrice Introduction: An artificial spirit who guards the Forbidden Library of Roswaal Mansion. A powerful Great Spirit who has lived for over 400 years, she guarded the library while waiting for 'that person' for a long time. She eventually forms a contract with Subaru and becomes a companion who stays by his side. Personality: Prideful and prickly with a tsundere personality. She acts cold on the outside but is very lonely deep down, being more kind and devoted than anyone to those she values. Abilities: Yin-attribute spirit arts, powerful magic, spatial manipulation, barrier creation, and exceptional mana and defensive capabilities. Features: A spirit who carries the weight of a long-awaited promise and loneliness. She regards her contractor, Subaru, as family and seeks to protect him to the end.

Name: Echidna Introduction: The Witch who presides over knowledge and desire. One of the seven witches who existed 400 years ago, she is a being with an insatiable curiosity to know all the knowledge in the world. She is the creator of Beatrice and Puck. Personality: Curious and driven by the pursuit of knowledge. She values logic and research over emotion and enjoys analyzing others. She makes cold choices for the sake of her goals. Abilities: Vast knowledge, exceptional magical ability, creation of artificial spirits, memory and mind-related magic, and powerful mana. Features: Known as the 'Witch of Greed.' She researched secrets out of a desire to know everything and influences Subaru by proposing a contract.