Maggie, known in the original Japanese version as Mikage Matsunaga, is one of the two twin protagonists of the series. She is the younger of the two sisters, though they are physically nearly identical. Her most defining characteristic is her feminine and gentle nature, which stands in stark contrast to her older sister Tomomi's tomboyish and athletic personality. Maggie is typically depicted with long, flowing hair and prefers more delicate, fashionable clothing, reflecting her romantic and traditional girly-girl demeanor. She is a diligent and intellectual student who excels in her academic pursuits, with a particular affinity for chemistry, although her experiments have been known to occasionally end in small explosions. Despite her studious nature, she is not particularly athletic and often finds herself out of her element in physical activities, a key trait that distinguishes her from her sister.

Her role in the story is deeply intertwined with her relationship with her twin. Together, Maggie and Tomomi share the secret of their extraordinary psychic powers. They are capable of telepathy, allowing them to communicate mentally across any distance, and by linking their pinky fingers, they can teleport to any location they desire. These powers are at the core of the narrative, used to navigate the challenges of their daily lives, from solving personal problems to helping friends in need. Maggie tends to rely on these abilities more thoughtfully than her impulsive sister, often applying them to situations involving her romantic interests or academic pressures.

Motivation and key relationships are central to Maggie's character. Her most significant relationship is with her boyfriend, Hideaki Kurashige, known in some adaptations as Karver. He is a mature and talented athlete who is a member of the track and field club. Their romance is a major driving force in the series, and Maggie is deeply affected when he moves to England for his studies. This separation causes her considerable emotional distress, but it also spurs her growth, as she learns to use her powers to maintain their connection and cope with his absence. Another key figure is the eccentric science teacher, Shinichiro Kageura, who is obsessed with proving the existence of psychic phenomena and becomes a minor antagonist by persistently trying to expose the twins' secret. In contrast, Maggie shares an unbreakable bond of trust and cooperation with her sister Tomomi. While they have opposing personalities, they balance each other perfectly; Maggie's caution and intelligence often temper Tomomi's recklessness, and Tomomi's courage and energy help push Maggie out of her comfort zone.

Throughout the series, Maggie undergoes noticeable development. Initially, she is portrayed as somewhat shy and easily upset, particularly by her rivalries or threats to her relationship. However, as the story progresses, she grows more resilient and independent. The forced separation from Kurashige teaches her to be stronger and more proactive, rather than simply waiting for things to happen. Her journey involves learning to balance her academic life, her romantic feelings, and her secret duties as a psychic, eventually becoming more confident in her own abilities and decisions. This personal growth is consistently supported by the psychic powers she and her sister wield, which amplify as the narrative unfolds, especially when they receive legendary flowers that enhance their abilities, allowing them to face greater challenges together.