Leon Adonis Coronaria is the crown prince and first heir of the Anemone Kingdom, a realm that upholds nobility and virtue. He is introduced as Pride Royal Ivy's fiancé in the first installment of the otome game Our Ray of Light. Physically, he is tall and slender with a refined, aristocratic build, short indigo-blue hair styled neatly, and deep blue-violet eyes that give him a calm and observant expression. His androgynous and well-proportioned features are noted as the game's primary source of charm.

Beneath his amiable facade, Leon carries a deep sorrow and a longing for freedom. He possesses the talent and patriotism expected of a future king, yet within the kingdom, rumors circulate that he is a ladies' man. His kind smile often conceals inner turmoil, as he is caught in a web of familial betrayal. His younger brothers, Edwin and Homer, plot to overthrow him by framing him in a bar incident that strips him of his honor and nearly leads to public disgrace and exile. Edwin in particular poses as a devoted sibling while secretly despising Leon and coveting the throne.

Pride, aware of the future events from her past-life memories, intervenes to rescue Leon and exposes the conspiracy orchestrated by his brothers. With the truth revealed, their father, the king of Anemone, reunites with Leon, crowns him the rightful heir, and strips the corrupt brothers of their titles and positions before imprisoning them. This event marks a turning point in Leon's role: he transitions from a victim of betrayal to a key ally of Pride, with his honor restored. His relationship with Pride deepens through this ordeal, as she actively safeguards his happiness and future.

In terms of development, Leon moves from a state of passive victimhood to an active participant in reclaiming his destiny. While he does not display overt supernatural abilities, he is characterized by his inherent talent for governance, his princely demeanor, and the charm that makes him a central figure in the game's narrative. His motivations center on fulfilling his duty as a ruler and escaping the machinations that threaten his position. His story arc underscores themes of justice, redemption, and the power of trust in overcoming betrayal.