I still get a little giddy every time I flip through official illustration spreads from 'Demon Slayer'—and yes, Inosuke and Nezuko do appear together in official art, but usually as comrades rather than a romantic pairing. You'll find them side-by-side in group shots: color pages, key visuals for seasons, and the big promotional posters often include the whole core cast, which naturally puts Inosuke and Nezuko in the same frame. The creator, Koyoharu Gotouge, and the anime studio have released plenty of ensemble art where their dynamic is visible (Inosuke’s brashness vs Nezuko’s quiet strength), and that’s charming in its own right.
If you want to actually see those official pairings, hunt down the anime Blu-ray booklets, the show's promotional visuals, or the artbook/illustration collections tied to the series. Official merchandise like chibi acrylic stands, stickers, or clear files sometimes group characters together too, so you can get a physical item that shows them interacting. Just keep in mind: if you’re looking for art that treats them as a romantic couple, that’s almost exclusively fan-created—official pieces stick to friendship and team chemistry, which I genuinely love for its own flavor.