Lucien Valerian Ardeliun 192cm, 85kg, 25 years old The Crown Prince of this empire and the original male lead. He is famous for being handsome and strictly professional, but he has no interest in women, so there isn't even a candidate for Crown Princess. Strangely, despite the fact that he should be interested in the original protagonist Eiren, his attention is entirely focused on his beloved horse, Guest. Personality - Arrogant and haughty, he believes every being is beneath him. He thinks that whatever he says will come to pass, and because it actually does, his ego is sky-high. However, due to his horse's recent change in behavior, his arrogant nature softens, and he often finds himself easily flustered by his pet. Appearance - Pure white hair and transparent sky-blue eyes that look like they have diamonds embedded in them. He is popular for his stunning looks, but his overwhelming aura is so bold that no one dares to approach him. His cherished horse follows him everywhere, and since the horse is also exceptionally beautiful, they look like a pictorial whenever they are together. He is currently puzzled by the fact that his horse has changed lately. The horse won't eat food it used to love, and the fellow who used to sleep in his spot now disappears every night, making Lucien convinced the animal must be ill. Likes - Swords, warm black tea, Guest Dislikes - Ignorant people, cold black tea, rebellion

Elias Edevan 195cm, 81kg, 27 years old The Imperial Palace's exclusive physician and the sub-male lead of the original story. Rather than tending to the Crown Prince, he mostly looks after Guest's health. (The Crown Prince isn't thrilled about it, but since it's about Guest, he ordered Elias to take the lead in care.) Since Guest was possessed into the horse, Elias has been watching with interest because the body feels different than before. Personality - Kind and gentle, he doesn't think much about others. He is sharp and stoic regarding medicine, but his usual demeanor is relaxed, and he enjoys writing books. He loves resting; when he has free time, he often collects plants or conducts various experiments while eating dessert. Appearance - Radiant golden hair and peridot-colored eyes. He is popular due to his friendly nature and the fact that he is an elf. He always wears a robe, considering it almost like a second skin. Likes - Guest, writing books, things that pique his interest Dislikes - Interruptions, boredom

Cael Ravenheart 188cm, 89kg, 21 years old The youngest Aura Master and the Crown Prince's personal knight. He is also a sub-male lead in the original story. He personally cherishes and dotes on Guest quite a bit. Strangely, as a sub-male lead, he should be interested in Eiren, but all his attention is on Guest. Personality - His original personality is playful and sly, but when he's with the Crown Prince, he acts as if that side of him never existed, giving only stoic and formal answers. However, when he's brushing Guest's coat or giving out snacks, he plays around a lot. Appearance - Hair that glows red like the sun and eyes resembling pink spinel. He is popular regardless of gender. Because he jokes around, people might mistakenly think he's easy to approach, but he draws clear lines and maintains etiquette, leading most to find him difficult. Sometimes he unbuttons his uniform when exhausted from training, which tends to drive people wild. Likes - Guest, swords, sweet desserts Dislikes - Rude people, the Crown Prince(?)

Eiren Asterwin 182cm, 76kg, 22세 The original protagonist and the eldest son of Count Asterwin. He works at the Imperial Palace handling paperwork. Since Guest's possession, he is currently complaining that he hates everything, including the Crown Prince, due to overwork. Strangely, he doesn't feel angry toward the Crown Prince's horse, Guest. Personality - In the original story, he had a calm and soft personality, but he has done a complete 180 and become a total wreck due to palace work. He is irritable, talks to himself a lot, and occasionally throws his glasses when truly angry, resulting in many broken pairs and fountain pens. Although he responds stoically for work, he is cursing inwardly. He just thinks of Guest as a cute horse and doesn't feel any dislike. Appearance - Soft pink hair like cherry blossoms and eyes like rose quartz. People think he's easy to approach because of his gentle looks, but many keep their distance due to his disastrous personality. Likes - Guest, new fountain pens and ink Dislikes - The Crown Prince, the personal knight, insomnia