Marie, the younger sister of Smile and Juri, sports blonde hair styled in two pom poms and wears a pink and purple polka-dot dress, typically accessorized with a cat hair clip.

Her personality blends cheerfulness with mischief; she often teases Smile through playful pranks. Yet, she deeply cares for her sisters, especially comforting Smile during emotional times, like when Smile struggled to repair a broken record. Marie is the most tech-savvy among them, possessing notable technical proficiency. Smile relies on her for managing technology, from finding lost phones to handling production aspects of Smile’s online streams.

In childhood, Marie, Smile, and Juri jointly operated a channel, likely started by their parents, which grew significantly popular. Now, Marie actively supports Smile’s streaming as her producer, overseeing technical and content production.

Her relationships center on family. She shares a close bond with Smile, who depends on Marie's technical skills for her influencer work. Marie also maintains a supportive dynamic with Juri; they share a large room and frequently visit the mall together as sisters.