Prince Charles, heir to the Emerald Kingdom throne, chafes under royal obligations. Restless and dissatisfied, he frequently escapes the castle disguised as the commoner "Alex," exploring the town to avoid princely duties. He possesses dark brown hair, cyan eyes, and fair skin, alternating between formal court attire of a red tunic, cape, and leggings, and the simpler blue pants and red vest of his incognito persona.

His personality blends adventurousness and playfulness with a strong aversion to the spotlight. Valuing authenticity over royal pomp, he actively seeks connections beyond the castle walls, driven by wanderlust to understand ordinary life and escape his position's rigid expectations. This habit leads him to frequently fabricate stories to maintain his disguise, earning the nickname "Charles the Fibber" from Cinderella after their initial encounters. Despite this immaturity, he demonstrates loyalty to friends and family and emerging cleverness in tricky situations. He firmly believes in marrying for love, not political convenience.

His development begins through a secret friendship with Cinderella, forged during escapades marked by accidental collisions and mutual assistance. Their shared adventures gradually deepen his empathy and sense of responsibility. A pivotal moment occurs when Cinderella falls ill, forcing him to attempt her household chores. His profound struggle, especially with cooking, grants him firsthand insight into her daily hardships, fostering immense respect for her resilience and catalyzing his understanding of duty and responsibility.

Direct conflict with Duke Zaral, orchestrator of plots to usurp the throne through forced engagements and assassination attempts, forces significant maturation. Charles uncovers Zaral's theft of weapons from the royal armory, leading to a confrontation where he and Cinderella are trapped in a well. Surviving a staged explosion, he later infiltrates a costume party at Cinderella's home during Zaral's castle takeover. Witnessing the capture of an imposter (Marcel), Charles publicly reveals his true identity, rallying loyal guards to defeat Zaral, restore his parents to power, and solidify his commitment to protecting the kingdom as heir.

Following the coup's failure, his parents organize a bride-finding ball. Uninterested in other attendees, he is captivated by a mysteriously familiar woman in a gown and glass slippers (unaware she is magically transformed Cinderella). Sensing a deep connection, he spends the evening with her. After she flees at midnight, leaving one slipper, he initiates a kingdom-wide search. Their reunion, secured by the slipper fitting, leads to engagement.

On his wedding day, Zaral reappears, poisons Charles, and kidnaps Cinderella. Charles, having anticipated treachery, feigned the poisoning's effects. He rescues Cinderella from Zaral atop the castle clock tower, engages in a final duel, and defeats Zaral permanently. With peace restored, Charles marries Cinderella, and they are crowned king and queen.

His relationship with Cinderella forms his core emotional arc. Meeting her as an equal while disguised allows genuine friendship to blossom, untainted by his title. Her persistent nickname "Charles the Fibber" underscores her role in challenging his dishonesty and grounding him. Though hurt by his deception and fearing social barriers, she distances herself upon discovering his identity, yet their bond ultimately transcends this rift. Her influence is central to his transformation from a truant prince to a responsible monarch.

He shares a respectful but distant relationship with his parents, the King and Queen. They express concern over his initial avoidance of duty but recognize his growth after he thwarts Zaral. His friendship with his page, Alex, facilitates his escapes and provides support throughout the political crises. Duke Zaral serves as his primary antagonist, whose schemes directly force Charles to develop strategic thinking, combat skills, and leadership capabilities.