Rianastia Yotsuba is a fictional character from the 'Doki Doki Precure' anime series. She is known for her vibrant personality and plays a key role in the storyline as one of the main magical girls, or 'Precures'. Rianastia is characterized by her compassionate nature and strong sense of justice, often acting as a moral compass for the group. Her magical abilities are crucial in battling the series' antagonists, and she inspires her teammates through her unwavering dedication to protecting the world from evil. Her character development throughout the series is marked by moments of personal growth and self-discovery.