Leila Takashiro, heiress to the vast Takashiro Zaibatsu conglomerate, comes from a wealthy and influential family. This background grants her a refined, elegant, and initially somewhat haughty demeanor. Extensively trained in traditional Japanese arts like tea ceremony, flower arrangement, and classical dance, she possesses exceptional grace and poise and attends the prestigious St. Pucchi Academy.

Leila discovers a magical pet named Raichi, who grants her the ability to transform into the magical idol Lilpri member Lil' Rose using the "Miracle Charmy Rose" item and the phrase "Miracle Charmy Up!". Her signature color is pink, and her magical attacks, such as "Lil' Rose Blizzard" and "Lil' Rose Shower," often involve roses and musical notes. Her performance style emphasizes classical elegance.

Initially, Leila's privileged upbringing fosters a degree of arrogance and a tendency to look down on others, particularly Natsuki and Bu. She prioritizes her family's expectations and her own image. However, her journey as Lil' Rose and her deepening bonds with the other Lilpri members – Natsuki, Bu, and eventually Seira – fundamentally change her. Through shared experiences, challenges, and the pursuit of collecting Wish Drops to save Wonder Kingdom, Leila learns the value of true friendship, teamwork, and humility. She gradually sheds her initial snobbishness, becoming genuinely caring and supportive of her friends and developing a strong sense of responsibility not just to her family, but to her fellow Lilpri members and their mission.

Leila harbors a deep affection for Prince Kanata of Wonder Kingdom, a significant motivation. She dreams of becoming a princess worthy of him, initially interpreting this through the lens of perfection and status. Her experiences refine this dream, focusing more on inner qualities like kindness and strength. Her relationship with her strict father is complex, marked by a desire to meet his high expectations while also seeking his understanding and approval of her path as an idol. Over time, she strives to balance her family duties with her Lilpri activities, demonstrating growing independence and conviction in her own choices.

Leila possesses a strong will, determination, and leadership qualities within the group, especially concerning strategy and presentation. She is highly perceptive and intelligent. Despite her initial reserve, she reveals a more playful and occasionally competitive side as she grows closer to her friends. Her refined skills in traditional arts seamlessly integrate into her Lilpri performances, giving them a unique and sophisticated flair. Her journey moves her from a sheltered heiress to a compassionate, loyal, and determined magical idol who values friendship above social standing.