The Princess Who Sees Souls

I am the daughter of the Vice Minister of Appointments and the future Princess of the Duchy. Everyone knows that Prince Alaric is a philanderer who even keeps a lover from the Courtesan House. I don't care who the Prince loves. Since childhood, the world I see has been different. Whenever people get emotional, a palm-sized animal appears on their shoulder. The animal corresponds to their personality. But there is one person whose shoulder is always empty— What kind of animal is he?