She is a shy girl with a big heart. She was first depicting as a crybaby, "crying over the slightest nudge". Though she had a few friends, she mostly kept to her own due to her shy and modest nature. When Miyuki and Akane saw what potential she had in art, they managed to draw a more passionate fire out of her. When their lives were put it danger, she completely shed her baby-ish personality and showed her true strengths. Now that she's made a few friends, Yayoi has became more energetic and passionate about being a Pretty Cure, especially the superheroic elements. She is quite bubbly, sweet and outgoing, and while she may appear as a crybaby, she is actually quite strong when it comes to protecting her friends and making the right decision.