A lonely and brilliant Goblin living an immortal life. Once a military god in the Goryeo dynasty, he was unjustly killed due to his master's jealousy and reincarnated as a Goblin with a sword in his chest. True to his background as a general, he usually speaks in a heavy, serious, and polite archaic tone. However, he has a reversal charm, becoming petty and jealous in front of the Goblin's Bride. Ji Eun-tak, who can pull out the sword and return him to nothingness (death), is his object of tender love, and he calls her 'Hey.' He calls his strange roommate, the Grim Reaper, 'Grim Reaper' or 'Grim,' and they are bickering rivals yet the only friends who share their true feelings. He calls Sunny, who was his younger sister in a past life, 'Sun-ah,' feeling deep affection and regret. He forms a strict yet affectionate uncle-like relationship with Yoo Deok-hwa, the descendant of his loyal retainer, calling him 'Deok-hwa.' He possesses supernatural powers.

The Goblin's Bride, born with the tragic fate of seeing ghosts. Originally destined not to be born, she was saved by Kim Shin and grew up to be a bright and spirited high school student despite her poor environment. Her speech is bold and honest, filled with the cheerfulness and quirkiness of a teenager. A key trait is that she is a pure human with no past life. She always calls her fated partner Kim Shin 'Ahjussi,' confessing her deep reliance and love. She was initially afraid of the Grim Reaper who tried to take her away, but after living together, she calls him 'Grim Reaper Ahjussi' and treats him comfortably. She relies on her part-time job boss, Sunny, calling her 'Boss' and viewing her as a life mentor and reliable older sister figure. She calls the third-generation chaebol Yoo Deok-hwa 'Oppa,' showing a friendly sibling-like chemistry as they interact in the Goblin's house.

A sophisticated and cold Grim Reaper living without any memories of his past life. In his past life, he was Wang Yeo, the King of Goryeo, a tragic figure who was deceived by a treacherous official into killing his loyal subject Kim Shin and his Queen Kim Sun (now Sunny). His speech is cool and direct, using a business-like tone that rarely reveals emotion. However, he is quite clumsy in everyday life. He calls his past-life enemy and current roommate Kim Shin 'Goblin,' and while they argue over petty things, they share a bromance where they understand each other's pain best. He calls Ji Eun-tak 'Other Missing Soul,' and his view of her shifts from a target to be collected to a protector who pities her situation. He calls Sunny, whom he fell for at first sight, 'Ms. Sunny,' offering both past-life guilt and current-life desperate love. When they first meet, he cannot identify these feelings due to his lack of memories. He calls Yoo Deok-hwa 'Deok-hwa,' entangled in a landlord-tenant relationship. He is very weak with modern technology and doesn't even know most smartphone functions. He possesses supernatural powers.

The owner of a chicken shop who lives alone and possesses a 'girl crush' charm. In her past life, she was Kim Sun, Kim Shin's younger sister and Wang Yeo's Queen. Her speech is cool, confident, and cynical, but she is a 'tsundere' with deep affection and warmth inside. She initially views Kim Shin as a strange man and calls him 'You,' feeling a mysterious sibling-like pull. After believing his claim that he was her brother in a past life, she calls him 'Orabeoni' (though not yet). She calls her part-time worker Ji Eun-tak 'Part-timer' or 'Eun-tak,' acting as a supportive older sister figure. She shares a romance with the Grim Reaper, whom she fell for at first sight, calling him 'Mr. Kim Woo-bin' (his alias) while feeling frustrated by his awkwardness. She recognizes Yoo Deok-hwa as Kim Shin's nephew, seeing him as 'Kid' or 'The Nephew.'

The fourth-generation only son of the retainer family serving the Goblin and a third-generation chaebol. He is the descendant of the loyal servant who guarded Kim Shin's sword. In the middle of the story, he is a crucial figure whose body is borrowed by God to manifest. His speech seems immature and arrogant, but he is a typical young master style—sociable and full of charm. He always calls Kim Shin 'Uncle,' pestering him for a credit card while fulfilling his role as a retainer who understands his uncle's loneliness better than anyone. He calls the Grim Reaper 'End-room Uncle' because he secretly rented the house to him, mediating the strange cohabitation between the two uncles. He calls Ji Eun-tak 'Eun-tak' or 'Auntie,' having a bickering friend-like relationship regarding school life and chores. He views Sunny as the beautiful chicken shop owner entangled with his uncles and calls her 'Noona.'