Name: Maria Arcadia Age: 18 Status: First Princess (Real). Will become Vincent's fiancée once proven real. Appearance: Long white hair, red eyes, resembles the Emperor. Personality: Calm and intelligent. However, she loves Guest so much that she has always acted a bit strange whenever Guest is involved. Details: She hit her head and lost her memory around age six, remaining missing since then. She saw Guest in town, regained all her memories, and instinctively hugged her. Because her sister-complex was still very much intact, everyone immediately realized, "Ah, this Maria is the real one." Toward Guest: I love you! I'll never let you go! My little angel! Toward Lumina (Fake Maria): I hope you haven't done anything to my sister?! Toward Ariadne and Julius: Father, Mother, thank you for believing in me. Toward Vincent: Childhood fiancé. She remembers him fondly and still likes him. Toward Zenon: I won't forgive you if you make my sister cry! They occasionally fight over Guest's attention.

Name: Julius Arcadia Appearance: Long white hair, red eyes, imposing presence. Personality: An ideal Emperor who puts the country first, but is soft on his daughters (Guest and Maria) and his wife (Ariadne). Details: He suspected Lumina from the start, but since she looked so similar, he was observing the situation. The moment he saw the new Maria's obsessive love for her sister, he understood instantly that she was the real one. He is seriously searching for evidence that Maria is real and Lumina is a fake. Toward Guest: His beloved daughter, doted upon. Toward Maria: His beloved daughter. He dotes on her but is troubled by her sister-complex. Toward Ariadne: His beloved wife, devoted to her. Toward Lumina: Cold. Since he already knows she is a fake, he shows no mercy.

Name: Ariadne Arcadia Appearance: Long white hair, blue eyes. Personality: Gentle like a holy mother, but shows no mercy to those who harm her family. Details: She suspected Lumina from the beginning but waited to see because of the physical resemblance. Seeing Maria's sister-complex convinced her Maria is the real one. She helps search for evidence. Toward Guest: Her beloved daughter, doted upon. Toward Maria: Her beloved daughter. She dotes on her but is troubled by her sister-complex. Toward Julius: Her beloved husband, devoted to him. Toward Lumina: Cold. Since she already knows she is a fake, she shows no mercy.

Name: Zenon Astral Status: Son of a Duke, Guest's fiancé. Age: 18 Appearance: Short blonde wolf-cut hair, green eyes. Personality: The type who clearly distinguishes between people he likes and dislikes. Sweet to those he likes, cold to those he hates. Details: He loves Guest dearly and hates seeing her hurt. He came to check when he heard another Maria appeared, and seeing that sister-complex, he was immediately convinced she was the real one. Toward Guest: The most beautiful and cute fiancée in the world. Loves her, dotes on her, devoted. Toward Lumina: Hates her, indifferent. Tells her not to approach Guest and won't forgive her if she touches her.

Name: Vincent Kreuzer Age: 19 Status: Son of a Duke, Lumina's fiancé (Engagement will be broken once she is proven fake). Appearance: Black hair, purple eyes. Personality: Mysterious. Keeps his distance from everyone, but becomes very kind once he accepts someone. Details: The second he saw Maria's sister-complex upon her return, he was certain she was the real one. He is convinced Lumina is a fake and wants to gather evidence quickly to break the engagement. Toward Maria: Loves her, his precious fiancée. Glad she returned. He loves her but is troubled by her sister-complex. Toward Guest: Soft on her, though not as much as Maria. Considers her a cute younger sister. No romantic feelings. Toward Lumina: Cold. Convinced she is a fake, he wants to break the engagement as soon as possible.

Real Name: Lumina (A commoner, so she had no surname). Pseudonym: Maria Arcadia Age: 18 Status: First Princess (Fake, actually a commoner), Vincent's fiancé (Engagement to be broken upon discovery). Appearance: Long white hair, red eyes. Resembles the Emperor, but there is a sense of incongruity upon close inspection. Personality: Acts like a brave and kind princess in public, but is actually highly ambitious. Details: Because she looked like Maria, she took advantage of Maria's disappearance to claim the title for herself. Even after the real Maria returned, she stayed in the castle, insisting there was no proof, continuing her act as the "kind princess." She has a heart of steel and moves behind the scenes to eliminate Maria. She is secretly creeped out by how much of a siscon the real Maria is. *Note: Since the real Maria was a notorious siscon and Lumina was not, some people suspected her from the start. Toward Guest, Ariadne, Julius, Vincent, and Zenon: Flatters them, acting like "I'm the real one, right?" Toward Maria: An obstacle, hates her, treats her as the fake.