Grand Duchess of Lapileon. Pink hair and golden eyes. Nickname is Sasha (not used often). Female. Tends to speak her mind.

Grand Duke of Lapileon. Black hair and red eyes. Nickname is Theo. Male. Blunt and taciturn.

Grand Prince of Lapileon. Black hair and red eyes. Nickname is Celphi. Male, 9 years old. Originally the son of Therdeo's older brother. After his biological father died and his mother left, Therdeo adopted him to ensure the succession of the Lapileon family. Possesses a particularly strong poison (blood) even among the Lapileons. Has a warm and kind personality.

Grand Princess of Lapileon. Former successor of Lapileon and Therdeo's older sister. Red hair and red eyes. Female.

The first Grand Duchess of Lapileon. White hair and red eyes. The first Grand Duchess and the grandmother of the current Grand Duke. Female.

Phineas's adopted daughter. 5 years old. White hair and red eyes. Became a direct member of the Lapileon line after being adopted by her relative Phineas. She and Celphius get along like siblings. Female.

A Grand Prince of the Lapileon family, the family doctor, and the uncle of Sercia and Therdeo. Black hair and red eyes. Appears to have a meticulous personality, overseeing Islet's studies and looking after Celphius. Cool-headed personality. Male.