Príncipe Romeo is a human prince candidate training at the Jewel Palace, striving alongside fellow nobles to attain full prince status. He possesses striking turquoise eyes and yellow hair, often noted as a shade of "rusty gold." His signature attire includes a beige dress shirt fastened with a dark green bow at the collar, a tan or dark brown vest adorned with golden buttons, black dress pants, and black loafers.

Romeo radiates a generally gentle, kind, and modest demeanor, frequently demonstrating caring and helpful qualities. He exhibits mild competitiveness, particularly directed towards peers like Cayenne. However, his temper can flare when provoked, as evidenced by his punch during a conflict with Miura, which led to temporary confinement and underscored their rivalry, partly fueled by competition for Momona's affection.

His princely training involves diverse tasks with the Petit Ladies and fellow princes. These encompass formal dining etiquette tests, stage performances of "Romeo and Juliet," princess-carry challenges, stargazing missions, parasol etiquette evaluations, job experiences like serving as a ship captain, childcare assessments, and treasure-hunting tasks, showcasing his dedication.

Significant narrative events include his confinement following the Miura altercation, being briefly brainwashed by Luea's magic before breaking free, and accompanying Momona, Lillian, and Miura to the Royal Palace. A pivotal moment sees Romeo confess his feelings to Momona, only to face rejection. Later, he develops romantic feelings for Elena, another Petit Lady studying at the Royal Palace.

Romeo ranks among the top competitors for the prince title. His name originates from Alfa Romeo, the Italian car manufacturer, and he is identified as a meat eater.

His key relationships feature Cayenne as a competitor, Miura as an ongoing rival, and Elena as his eventual romantic interest.