Nice to see you want to go to Japan one day, it is a really cute place and there's just so much to explore there, such as all the awesome games, anime and manga there.
Anyways, I'm Nichole (my real name btw), 23 years old and a long-time fan of Pokemon as well. My fave generation is actually 5th Gen, but I do enjoy 6th Gen as well. But I have to definitely praise X/Y for trainer customization and OR/AS for some extra new features. As for what I want to see in Z? Maybe keep a feature like OR/AS's DexNav and maybe some new outfits in the trainer customization as well.