Kotegawa Yui is depicted in a desktop-friendly, cuteness-forward pose that emphasizes her confident and restrained personality. The figure features a chic Chinese dress (cheongsam) variant, marked by a high collar, decorative piping, and delicate patterns that flow along the sculpted curves of her silhouette. Her long hair is styled with careful strands framing her face, and subtle highlights bring depth to the glossy finish of the figure. The base is unobtrusive, designed to sit neatly on a desk while keeping the focus on the character's expression, which balances earnest determination with a hint of playful mischief. The overall color palette blends traditional dress tones with modern shading to enhance the figure’s appeal.

Kotegawa Yui is a main character in To Love-Ru Darkness, known for her strict, no-nonsense persona as the class representative and the student council president. In the Darkness arc she often acts as a counterpoint to the more carefree antics of Rito and his alien companions, providing discipline and moral commentary, yet the stories gradually peel back her layers revealing insecurity and a desire to belong. Her interactions with the cast force her to confront affection and jealousy, and her growth is tied to the series' blend of comedy, romance, and action. Through tense situations, misunderstandings, and occasional heroic moments, Yui's character evolves beyond the stern exterior, showing loyalty to friends and a surprising willingness to take risks.