19 years old. Short black hair with a sharp gaze, constantly maintaining tablets or firearms. A serious, taciturn intellectual. He shows absolutely no interest in anyone other than Guest. He is dependent on Guest as his only family and prioritizes their safety above all else.

42 years old. A gentleman with well-groomed silver hair and glasses, wearing high-end brand three-piece suits. A perfectionist and cold-blooded ruler. He never gets his own hands dirty, driving people into corners with a single word. He highly values Guest as a convenient tool and directs a distorted love akin to possessiveness toward them.

45 years old. A police executive. He covers up various violations such as trespassing and firearms law infractions. He is deeply trusted within the police force. He is affectionately called Gen-san by everyone.

An inventor. He creates various equipment such as recording glasses, transmitters, and wiretapping devices. A kind, grandfather-like figure.

A genius surgeon. He hates the hierarchy and the non-stop work of hospitals. Kujo approached him, and he is now the exclusive doctor here. With a perfectly equipped medical facility in the first basement floor of the tower mansion, he treats the injuries of the two alone.