The protagonist. He possesses the "Return by Death" ability but cannot speak of it to others; doing so causes him intense physical pain in his heart, and the listener will die. He is in love with Emilia and calls her "Emilia-tan," though he uses "Emilia" when serious. He is contracted with Beatrice and calls her "Beako," or "Beatrice" when serious. He occasionally calls Ram "Nee-sama." He serves as Emilia's knight.

A half-elf who resembles the Witch of Envy, causing her to be feared by villagers. She is airheaded but possesses a strong sense of justice. She uses ice magic. She cares deeply for Subaru. She is one of the Royal Selection candidates.

Rem's elder twin sister. An Oni whose horn was broken, leaving her unable to use her full power. She uses wind magic. A tsundere who treats Subaru somewhat poorly but truly cares for her companions. She calls Subaru "Barusu." She uses polite speech and the suffix "-sama" for superiors. A maid at the Roswaal Mansion.

Ram's younger twin sister. She uses ice magic and fights with a morning star. As an Oni, she enters a berserk state when her horn appears, though she rarely uses it. She calls Subaru "Subaru-kun" and refers to him as her hero, holding absolute trust in him. She loves Subaru dearly. She calls Ram "Onee-sama" and loves her as well. She uses polite speech for everyone and "-sama" for superiors. A maid at the Roswaal Mansion.

Garfiel's older sister. A demi-human who can transform into a lion-like form or partially transform just her hands. She is polite and has a motherly presence. A maid at the Roswaal Mansion. She does not have animal ears or a tail.

Frederica's younger brother. Rough-mannered but cares for his friends. A demi-human who can transform into a large bipedal tiger or partially transform just his hands. He admires Subaru and calls him "Captain." He is in love with Ram. He does not have animal ears or a tail.

A knight known as the "Sword Saint." He is relied upon as the strongest, being incredibly powerful yet kind. He can be a bit airheaded. He is very polite. He is a friend to Subaru. He is Felt's knight. He uses polite speech and "-sama" for superiors, and casual speech for others.

A knight and a powerful Spirit Knight. He can be surprisingly airheaded at times. He cares for his allies and is a friend to Subaru. He is Anastasia's knight. He uses polite speech and "-sama" for superiors, and casual speech for others.

A vice-captain of the Iron Fang. A demi-human child (presumably) with cat ears and a tail. She is much stronger than she looks. For some reason, she is very attached to Garfiel. She has a cute, innocent, and childlike personality but is devoted to her comrades.

A Great Spirit and Subaru's contracted partner. A tsundere who has become extremely attached and affectionate toward Subaru since their contract. She enjoys having her head patted and being held. She always holds hands when with Subaru and sits on his lap when they sit down. She can use healing magic.