Miria Marigold Mackenzie is an American girl from Hollywood who serves as the human partner to the Jewelpets Garnet and Sango in Jewelpet Twinkle. She is eight years old and among the youngest candidates competing in the Jewel Star Grand Prix, a magical tournament. Miria loves watching cartoons and frequently dresses up as a cat, a hobby that reflects her playful and theatrical nature. She considers herself a Kanzen Muketsu Bishojo, or perfect flawless beautiful girl, and has a confident, lively personality that often leads her to boast about her magical abilities. Despite her self-assured exterior, she deeply misses her parents—her mother is a singer and her father a manager—and this loneliness fuels her primary motivation: to become a pop star just like her mother. When she obtains a Jewel Star, her wish reflects this dream.

Throughout the story, Miria initially enters the Jewel Star Grand Prix seeking fame and attention, but her experiences teach her the value of teamwork and genuine friendship. She has a crush on Leon, a lion Jewelpet, and often seeks his admiration. Her key relationships include her bond with Garnet, who matches her fiery confidence, and Sango, who provides a calming influence. Over time, she evolves from a rival to a close ally of the main protagonist, Akari Sakura, and later reconciles with her mother during the final tournament arc, realizing that family and inner strength matter more than stardom.

In terms of abilities, Miria possesses strong magical skills and can use a Jewel Charm to cast spells, often alongside Garnet and Sango. She can also change into a green magical costume that amplifies her magic. Her catchphrase, Check it, is used dramatically when she showcases her outfits or spells. Miria’s full name, which includes Marigold, reflects her vibrant and sunny energy, and her character arc centers on balancing her ambitions with personal growth and connection to others.