Maria Himesato originates from the *Aikatsu!* franchise and appears in *Aikatsu on Parade!*. She is the daughter of wealthy parents who own a mountain-based farm and mansion. Her childhood involved periods of loneliness due to her parents' frequent business travels, keeping them away for most of the year. Despite this, she developed a deep affection for her mountainous homeland and its natural environment, particularly the daisies (or asters) blooming in the highland meadows. Her life changed when Dream Academy's headmistress, Tiara Yumesaki, witnessed her radiating kindness during a chance encounter. Maria descended the mountain to offer refreshments to Tiara's team during a photoshoot, leading to her recruitment into Dream Academy.

Physically, Maria possesses caramel-colored (or ochre/orange) hair styled in ringlets, often adorned with a light blue and pink flower hairband or floral clip. She has dark purple (or violet) eyes and fair skin. Her demeanor reflects her upbringing, characterized by ladylike grace, soft-spoken gentleness, and innate consideration for others, exhibiting no pretentiousness despite her affluent background. She is skilled with cosmetics, demonstrating a particular talent for selecting complementary nail polish colors, and maintains a sweet tooth, with Sachertorte noted as her favorite food.

As a Dream Academy idol specializing in the cute type, Maria prefers the Aurora Fantasy brand, a fairytale-inspired label symbolizing princesses and fantasy motifs, aligning with her princess-like aura ("Hime" translates to "princess"). Her performances often feature an idol aura incorporating fairy tale icons and pink geraniums. She debuted using a Premium Rare Coord from Aurora Fantasy. Maria shares her singing voice, brand preference, and zodiac sign (Aries, born April 18) with fellow idol Sakura Kitaōji. Her image color is apricot, and her theme song is "Aurora Princess".

Key relationships define her journey. She shares a close bond with Dream Academy classmate Sora Kazesawa; they frequently collaborate on lessons, television appearances, and advertisements. During the Partners' Cup, Maria partnered with Otome Arisugawa. To strengthen their partnership, Maria visited Otome's kindergarten, listening to childhood stories while assisting with activities. Their performance style blended Otome's energetic "Powa-Powa" with Maria's gentle "Snuggly Mood." Maria also formed a significant friendship with Sakura Kitaōji, rooted in their mutual love for Aurora Fantasy. Following the departure of another top idol, Maria and Sora ascended to become leading figures in the Aikatsu rankings.

Her cow, Elizabeth III, is noted as part of her farm background. Maria is recognized as the only cute-type idol whose given name is written in katakana rather than hiragana. She shares her given name with characters from other franchises but remains distinct within the *Aikatsu!* universe.