The character known as King in Mahō no Angel Sweet Mint is the ruler of the magic kingdom and the father of the protagonist, Mint. He is depicted as a monarch who cares deeply for his daughter, showing a strong paternal affection and a desire to see her succeed. His role in the story is primarily established at its outset, where he is shown celebrating Mints twelfth birthday alongside his wife, Queen Lime.

Kings primary motivation is the well-being of his kingdom and his daughter. The magic kingdom, over which he presides, is directly connected to the hopes and dreams of the human world; as people on Earth lose faith in their dreams, the environment of his realm begins to wither. To address this crisis and to help Mint prove her qualifications as a future wise ruler, he makes the pivotal decision to send her to the human world. Demonstrating his protective nature, he arranges for her to live with his sister, Herb, who runs a shop called the Happiness Shop on Earth. This action sets the entire narrative in motion.

While no specific details about his personality or personal development throughout the series are available, his inherent character is defined by a blend of tenderness and principle. He is known to care for his daughter terribly, yet he remains adamant and firm when situations arise that go against established norms or rules, a trait that has been known to cause occasional disagreements with Queen Lime. His key relationships are therefore central to his identity: he is the loving father to Mint, the husband to Queen Lime, and the brother of Herb, whose human-world home becomes Mints base of operations.

No information is available regarding any notable magical abilities, combat skills, or other unique powers possessed by the King, nor is there detail on his personal development or evolution as a character across the series. His function is primarily as a foundational figure who establishes the heros quest and represents the authority and stability of the magical realm she is trying to protect.