Standing figure depicts Oyama Mahiro in a classic school uniform (seifuku) with precise sculpting that captures her cheerful, wide-eyed expression and dynamic pose suitable for desk display. The 130 mm tall figure balances delicate features, a glossy paint finish on the sailor collar, ribbon, and pleated skirt, and subtle shading on hair and fabric to convey depth. The seifuku version emphasizes Mahiro's charm, with careful attention to the pleats, seam lines, and small accessory details such as a bow at the collar and typical school-boot-like shoes. The base is compact, designed for stability on a desk, preserving a cute, approachable vibe.

Mahiro Oyama is the central protagonist of Onii-chan wa Oshimai!, a story that playfully blends slice-of-life with magical body-swapping antics. In the narrative, the character awakens to a transformed circumstance and must navigate daily life while adjusting to a new appearance and social expectations, all while clinging to their original hobbies and personality. This figure captures Oyama in the Seifuku Ver. as a friendly, endearing student-like figure who faces everyday challenges with humor and resilience. Interactions with family, friends, and the evolving sense of identity drive much of the series’ warmth and comedy, appealing to fans who enjoy character-driven storytelling and lighthearted misadventure. The pose suggests a moment of poised confidence amid playful chaos, illustrating the character's blend of charm and determination.