Desumasu is rendered in a charming chibi style, giving it a lively, approachable silhouette. Standing roughly 140 mm tall, the figure features a large head with expressive eyes and a compact body, conveying curiosity and playfulness. The sculpt showcases crisp contours for fur textures and smooth fabric-like surfaces for clothing, with subtle shading to suggest light and depth. The pose invites a narrative moment, as if Desumasu has paused to peek into Mimikyu's Costume Shop, one tiny accessory raised and a playful, haunted village-inspired base completing the scene with whimsy.

Inside the Haunted Pokémon Village, Desumasu is a young explorer who travels between misty stalls in search of whimsical outfits for his friends. He befriends the shopkeepers at Mimikyu's Costume Shop, who craft disguises that reveal hidden personalities rather than changing appearances. Desumasu's gentle curiosity often leads him into mischief, yet his kindness helps others feel seen and valued when their costumes reflect their true quirks. Across night-lit lanes and creaking wooden boards, his adventures celebrate friendship, self-expression, and the comforting magic that comes from sharing stories and imagination.