This Delta Koubou 1/7 scale figure of Oyama Mahiro captures the character's bright personality with careful attention to expression and pose. Standing in a dynamic, slightly forward-leaning stance, the figure features flowing hair sculpted to convey movement and subtle shading that highlights her youthful look. The outfit is rendered with delicate folds and textured surfaces to resemble fabric, while accessories and base add context to the series setting. The color palette emphasizes Mahiro's signature tones, and the painting work is clean with precise linework to evoke the original character. Overall, it presents a striking display piece for fans.

Oyama Mahiro is the central character of Onii-chan wa Oshimai!, a series that mixes comedy, everyday life, and a touch of magical whimsy. As a beloved but relatable figure, she navigates school, family, and friendships while dealing with the unusual circumstances that shape her world. The story explores themes of identity, self-acceptance, and the bonds between siblings as Mahiro's adventures reveal her growth from a self-described otaku into someone who understands responsibility and connection with others. Her playful, sometimes self-deprecating humor drives the narrative, inviting audiences to root for her journey.