Yeah, Marty is the pompompurin-inspired villager so if you scanned him in you'll get a pompompurin poster under special goods -> posters in your catalogue. I'm pretty hopeful the sanrio villagers will come back someday tbh since those posters exist and the villagers themselves made it into pocket camp, but I'm less sure about the nintendo ones--which is strange given that their properties are, well,
nintendo-owned and Splatoon even shares a dev team with AC. You'd think their
cards figures (why did I say cards at first omg, zelda and splatoon amiibo don't have cards!) would give you Zelda and Splatoon posters or something but nope

Guess we'll just have to wait and see.