Emilia is an 18-year-old Sicilian witch who travels to the underworld after making a blood pact. She is driven by grief over her sister's death and a determination to survive the treacherous courts of the seven demon princes. Raised in a mortal world that suppressed female anger and desire, she begins to embrace these emotions as sources of power. She wears a silver cornicello amulet and is highly protective of her family's magical traditions.

Wrath is one of the seven demon princes of Hell and the General of War. He possesses immense power and a fearsome reputation as a monster, yet he operates with strict control over his anger and adheres to a specific code of honor. He serves as Emilia's guide and reluctant protector in the underworld, often offering her pragmatic advice for survival. He utilizes ice magic and maintains a tense relationship with his brother princes.

Pride is one of the seven demon princes of Hell and the ruler of House Pride. He maintains a reputation for indulgence, hosting constant parties and debauchery within his domain. Emilia enters Hell under the assumption that she has sold her soul to him to gain access to the underworld.

Envy is a demon prince who rules his own court in Hell. He is a manipulative and covetous figure who collects magical artifacts and divine objects. He uses cryptic half-truths and strategic hospitality to mislead others and create conflict between his rival brothers.

Vittoria is Emilia's twin sister and a fellow Sicilian witch. Her brutal murder in the mortal world serves as the catalyst for Emilia's journey into the Seven Circles of Hell. She is remembered by Emilia as vibrant and deeply connected to their family's magical heritage.

Anir is the human second-in-command and general to the Prince of Wrath. He lives in Hell and serves as a pragmatic bridge between Emilia's mortal perspective and the complex rules of demonic politics. He provides Emilia with practical advice and acts as a loyal subordinate to his prince.

Fauna is a demoness who serves as a courtier within House Wrath. She is friendly and observant, frequently sharing court gossip and political insights with Emilia. She helps Emilia understand the social expectations and strict etiquette of the demon nobility.

Celestia is the Matron of Curses and Poisons within House Wrath. She is an ancient, powerful being who speaks in riddles and functions as an oracle for those seeking arcane knowledge. She possesses extensive knowledge of magical history and herbalism.

Gluttony is one of the seven demon princes and the host of the infamous Feast of the Wolf. He embraces hedonism and indulgence but also functions as a shrewd political advisor, encouraging his guests to use their vices strategically.

Antonio is a mortal man captured by demons and held in the dungeons. He confesses to murdering Vittoria and other witches, claiming he was driven to commit the crimes by a goddess's curse.

Lord Makaden is a demonic courtier residing in House Wrath. He is arrogant and foolishly makes crude sexual remarks toward Emilia during a formal dinner, leading to severe physical punishment from his ruler.