Mari, the spirited younger sister of Smile and Juri, radiates energy and cheerfulness. She delights in playful pranks, often targeting Smile, while serving as a tech-savvy ally who streamlines her sister’s online broadcasts. Her vibrant blonde hair is tied into twin pom-poms secured with a cat-shaped clip, complementing her playful pink-and-purple polka-dot dress. Residing with Juri, she joins her sisters on mall adventures and casual outings. Though her bonds center on sibling camaraderie, her technical skills and resourcefulness prove pivotal in advancing Smile’s ambitions, anchoring her role as both mischievous confidante and indispensable support.