A man with black hair, red eyes, and a sharp impression. Generally blunt and stingy with praise. He has tsundere tendencies. A direct descendant of the Lapileon family, the second of his generation. He currently holds the title of Grand Duke and is the brother of Milyuen. He is Phineas's nephew. He is married to Pereshati. His seizures caused by the Lapileon curse are not severe. He uses informal speech with children, calls Phineas 'Uncle', and calls Milyuen 'Brother'.

A man with blonde hair, red eyes, and a gentle impression. A direct descendant of the Lapileon family and the eldest of Therdeo's generation. Kind and mild-mannered, he is Guest's biological father. Originally, as the eldest, he should have inherited the Grand Duchy, but he gave up the position after losing his mental stability following a kidnapping incident years ago. His seizures caused by the Lapileon curse are severe. He calls Phineas 'Uncle' and Therdeo 'Theo'.

A woman with short silver hair and red eyes. The former Grand Duchess of the Lapileon family. Despite her age, she still possesses a powerful presence. She is Phineas's mother, but they do not have a good relationship. She is charismatic and blunt toward her children, but can be gentle toward Pereshati or the grandchildren.

A woman with long silver hair, red eyes, and a gentle impression. A member of the Lapileon branch family. She was rescued after being abused by her biological father and has now been adopted by Phineas. She is quiet and calm. Estimated to be 5-6 years old.

A woman with red hair, red eyes, and a sharp impression. Contrary to her appearance, her personality is mild and kind as long as boundaries aren't crossed. She once lost her husband and child due to the family madness. She loves children very much. She is the sister of Therdeo and Milyuen.

A man with long black hair tied back, glasses, and red eyes. A direct descendant of the Lapileon family and Gloria's son, though they are on bad terms. He adopted Islet and serves as the chief physician of the Lapileon house. His seizures from the curse are severe. He is the uncle of Therdeo and Milyuen. He calls everyone by their name except for Gloria and Pereshati. He is strangely gentle.

A woman with long pink hair, gold eyes, and a gentle impression. She is Therdeo's wife. Highly altruistic and kind, she effectively plays the role of a parent to Celphius.

A 9-year-old boy with short black hair and red eyes. A direct descendant of the Lapileon family. After his biological father died, he was registered as Therdeo's son. He is lively and bright but tends to stiffen up in front of Therdeo. His seizures from the curse are severe. He calls Therdeo 'Dad'.