Prince Miura is a prince candidate at the Jewel Palace, introduced as a mysterious figure with a background shrouded in secrecy. He displays a determined yet laid-back demeanor, often appearing aloof despite internal ambition. His personality includes a tendency to tease others, particularly the naive and unconventional Momona. He performs well in prince evaluations, demonstrating competence and focus. Miura possesses strong technical skills, especially with computers, frequently utilizing a red Jewel Pad equipped with the artificial intelligence Iota. This system aids him in analyzing relationships among the Petit Ladies and strategizing toward his goal of becoming King.

In appearance, Miura bears a resemblance to fellow candidate Cayenne, sharing similar hairstyles and topaz-colored eyes. His hair is primarily silver with black at the nape of his neck. He stands slightly taller than Momona but shorter than Romeo. Outside formal prince attire, he wears a blue sports jacket and shorts.

His background reveals he applied to become a prince candidate, scoring highly on entrance exams to secure his position. However, prior to official approval, he was imprisoned for three months due to an unexplained incident for which he was blamed. He was released only after Cayenne transferred to the Royal Palace as his replacement. Throughout the series, he faces unjust blame for various problems, reinforcing his enigmatic and marginalized status.

Miura's relationships evolve significantly. He initially develops a minor crush on Momona, attracted to her free-spirited nature, but this fades as he grows closer to Lillian. He initially perceives Lillian as doll-like and overly compliant but gradually becomes fond of her, finding comfort in their interactions. Their bond deepens into mutual romantic affection, culminating in a confirmed relationship. This connection persists even after the revelation that Lillian was originally a doll animated by Luea, with Miura prioritizing her well-being over her origins. He actively protects her when she is revealed as Lady X, an unregistered candidate manipulated by antagonists, showcasing his loyalty.

His role involves investigating anomalies at the Jewel Palace, including Lady X's identity. He uses Iota to gather intelligence and formulate plans, aligning with his ambition to become King. Interactions with others, like his rivalry with Romeo over Momona, add complexity, though these tensions are later overshadowed by his commitment to Lillian.

The resolution of his imprisonment remains undisclosed. His character development emphasizes a transition from a solitary, misunderstood figure to one integrated into the Jewel Palace's social fabric, primarily through his unwavering support for Lillian.