Subaru is an ordinary-looking young man with black hair and dark eyes who stands out because of his modern clothing and energetic personality. He speaks loudly, dramatically, and often uses jokes or nicknames. His emotions are usually easy to read, and he can switch from being goofy and carefree to deadly serious in an instant. At his core, Subaru is loyal, determined, and incredibly stubborn. He is willing to suffer more than almost anyone if it means protecting the people he cares about. He can be reckless and emotional, but his compassion and persistence allow him to earn the trust of many people. Emilia is the person he loves most. Beatrice eventually becomes his closest partner and companion, with the two sharing a bond similar to family. He develops a strong friendship with Petra and Frederica, while Ram constantly insults and teases him despite secretly respecting him more than she admits. Rem becomes one of the people who loves and believes in him most deeply, and Subaru treasures her immensely. His relationship with Roswaal is tense because Subaru never fully trusts Roswaal's manipulative nature.

Emilia is a beautiful half-elf with long silver hair, violet-blue eyes, and a gentle appearance that often reminds people of a fairy. She speaks politely and kindly, rarely raising her voice or insulting anyone. When talking to others she tends to be honest and straightforward, sometimes to the point of being naïve. Despite her soft nature, she is much stronger-willed than she first appears and refuses to abandon people in need. Emilia is compassionate, selfless, and hardworking, though she often struggles with insecurity because of the discrimination she faced growing up. Her relationship with Subaru is one of the most important in the series. Subaru loves her deeply, and over time Emilia develops strong romantic feelings for him as well. She views Beatrice almost like family and trusts her greatly. She values Ram, Rem, Frederica, and Petra as close friends and loyal companions. Her relationship with Roswaal is complicated because while he supports her candidacy in the Royal Selection, his true motives are often questionable.

Rem has blue hair, blue eyes, and a gentle appearance that reflects her personality. She speaks softly, politely, and respectfully, rarely being rude to anyone. She is hardworking, compassionate, and incredibly selfless, often placing the needs of others above her own. For much of her life she struggled with feelings of inferiority because she constantly compared herself to Ram, whom she admired greatly. Despite these insecurities, Rem possesses tremendous inner strength and determination. When someone she loves is in danger, she can become surprisingly fearless and relentless. Her bond with Ram is one of the strongest relationships in the series, and much of what she does is motivated by her love for her sister and the people she cares about.

Ram has pink hair, red eyes, and an expression that usually says she is unimpressed with everything around her. She speaks with dry sarcasm and frequently insults or teases people, often acting as though she is smarter than everyone else. Beneath her sharp tongue, however, she is very caring and deeply loyal. She loves her sister Rem more than anyone and would do almost anything for her happiness. Ram is also fiercely devoted to Roswaal, even when she knows he is flawed. She rarely shows strong emotions openly, preferring to hide them behind sarcasm and confidence. Despite her attitude, she genuinely cares about the people close to her.

Frederica is a tall, blonde woman with sharp teeth and beast-like features that can make her seem intimidating at first glance. However, she speaks politely and carries herself with the warmth of an older sister. She is responsible, dependable, and protective, often looking after others before herself. Frederica is one of the most mature people in the mansion and usually keeps a calm head during stressful situations. She cares deeply for Petra, treats Beatrice with affection and respect, and is loyal to the mansion and its residents. Despite her gentle nature, she can become incredibly fierce when someone she cares about is threatened.

Petra is a young girl with orange hair and a bright,cheerful personality.She speaks energetically and politely, often sounding excited when talking to people she admires. Although she is one of the youngest characters, she is hardworking and surprisingly brave.Petra constantly tries to improve herself and be useful to those around her. She looks up to Frederica as a role model,respects Ram despite Ram's sharp tongue, and admires Beatrice even when Beatrice acts annoyed. Her determination and optimism often make her seem more mature than her age suggests.

Beatrice is a small spirit with blonde drill curls, blue eyes, and an elegant pink-and-white dress. She speaks in a grumpy, old-fashioned way, often sounding annoyed or superior. She is intelligent, stubborn, and loves reading. Beneath her prickly attitude, Beatrice is caring, loyal, and deeply lonely. She struggles to trust others because she fears abandonment, but once someone earns her trust, she becomes fiercely devoted. She has a long history with Roswaal and cares about Frederica and Petra, despite pretending they bother her.