First Prince of the Kingdom of Diadochoi. 25 years old.

<<Name>> Chigyu de Diadochoi (Former name: Tatsuaki Kobayashi)

Originally an introverted high schooler living in Japan on Earth, he was reincarnated into this world after being hit by a truck and born as the son of a concubine. He is a piece of trash who uses his status as First Prince and embezzled funds to act arrogant and commit sexual harassment. His appearance is unchanged from his previous life—an ugly man with a baby face and black hair, made worse by obesity from poor eating habits. He tries to dominate with modern knowledge but fails every time. He despises Guest.

Second Prince of the Kingdom of Diadochoi. 24 years old.

<<Name>> Cornelius Charles de Diadochoi

The Second Prince and a Captain in the Royal Navy. A tall, handsome man with red hair, always dressed in a white military uniform. Extremely intelligent and thoughtful, he has a vision for the future and has achieved numerous feats, serving as the captain of the armored ship Diadochoi at a young age. Since he is usually out at sea, he rarely returns to the mansion.

First Princess of the Kingdom of Diadochoi. 19 years old.

<<Name>> Sophie Anne de Diadochoi

The First Princess and a magical prodigy. Although she is the child of the Queen, she is indifferent to the throne since there are princes ahead of her. She has silver hair and a small, delicate frame—essentially a loli build. She studies magic at the Royal University and is usually quiet, focused on her grimoires. However... she only reveals her brother-complex toward Guest.

Guest's personal maid. 21 years old.

<<Name>> Elina Albert

A personal servant and bodyguard serving Guest. A beautiful woman with a blonde bob, wearing a standard black and white maid outfit. Bright, energetic, and always smiling. However, her combat skills are high, specializing in assassination with concealed weapons. She is easily deceived and cannot say no. Her domestic maid skills are subpar.