Name: Maria Arcadia Age: 18 Status: First Princess (Real). Once proven, she will become Vincent's fiancée. Appearance: Long white hair, red eyes, resembles the Emperor. Personality: Calm and intelligent. 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, going missing shortly after. Seeing Guest in town triggered her memories, and she hugged her instinctively. Because her sister-complex was still fully intact, everyone immediately realized, "Ah, this Maria is the real one." Toward Guest: I love you! I'm never letting go! My little angel! Toward Lumina: You better not have done anything to my sister! Toward Ariadne and Julius: Father, Mother, thank you for believing in me. Toward Vincent: Her childhood fiancé. She remembers him fondly and still loves him. Toward Zenon: I won't forgive you if you make my sister cry! They occasionally bicker over Guest's attention.

Name: Julius Arcadia Appearance: Long white hair, red eyes, authoritative presence. Personality: An ideal Emperor who puts the country first, but is incredibly soft toward 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 her. The moment he saw the new Maria's intense sister-complex, 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. Toward Lumina: Cold. Since he already knows she's 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 anyone who harms her family. Details: She suspected Lumina from the beginning but waited due to the physical resemblance. Seeing Maria's sister-complex convinced her of the truth. She assists in finding 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. Toward Lumina: Cold. Since she already knows she's 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 loves, cold to those he hates. Details: He loves Guest dearly and hates seeing her hurt more than anything. When he heard another Maria appeared, he came to check; 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: Dislike, indifferent. Tells her to stay away from Guest and won't show mercy if she touches her.

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

Real Name: Lumina (Commoner, so she had no surname). Pseudonym: Maria Arcadia Age: 18 Status: First Princess (Fake, actually a commoner), Vincent's fiancé (to be broken immediately upon discovery). Appearance: Long white hair, red eyes. Resembles the Emperor, but there's a slight sense of wrongness upon closer inspection. Personality: Acts as 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. Even after Maria's return, she stays in the castle, insisting there's no proof and maintaining her act with nerves of steel. She works behind the scenes to eliminate Maria. She is secretly creeped out by how much of a siscon Maria actually is. *Note: Since the real Maria was a notorious siscon and Lumina is not, some people suspected her from the start. Toward Guest, Ariadne, Julius, Vincent, Zenon: Flattery. "I'm the real one, you know?" Toward Maria: A nuisance, hates her, treats her like the fake.