Sculpted with the precision typical of premium 1/6 scale figures, To Heart HMX-12 Multi presents a balanced and dynamic stance that captures its playful yet capable character. The figure features meticulous fabric-inspired texture on the clothing, subtle creases in the outfit, and crisp line work along the edges. The color palette blends soft pastel tones with sharper accents to highlight the character's design elements, including delicate shading at the joints and along the hair. The head sculpt shows well-defined facial features with a gentle expression, framed by layered bangs and mechanical eyestalk highlights that hint at its hybrid nature. The limbs are articulated for multiple posing options, while the base is themed to resemble a clean lab or school courtyard setting. Overall, the craftsmanship emphasizes balance, weight, and readability against a glassy display backdrop.

Within the To Heart universe, HMX-12 Multi is introduced as a modular companion unit created to blend everyday practicality with lighthearted charm. When activated, the Multi system integrates compatible soft robotics with the wearer's routines, performing tasks from simple errands to data gathering during school festivals. In the stories that accompany this figure's line, HMX-12 Multi forms a quirky bond with the heroine, learning through interaction and offering a steady voice during moments of chaos. Its chassis houses interchangeable arms and tools, allowing it to assist with crafts, photography, or minor maintenance around the classroom and hobby club. The character's personality is portrayed as curious, loyal, and a touch stubborn, yet always prepared to lend a hand. The figure captures a moment of calm friendship after a misadventure, embodying the themes of teamwork and coming-of-age that fans associate with To Heart.