In the future, he will build up either Konoha or his own. So yes there is kingdom or Village building later on.

Yeah, the beginning isn't the best ever. I forgot the water weakness at first then added it in after I already published the chapter, causing it to be a little bleh. In my opinion, it's starting to get a lot better in the last 2 chapters.

While when making this book I couldn't find much about the Zushi Zushi no mi itself, I could find exactly how devil fruits in general increase from the One Piece Wiki. "After consuming a fruit, the user does not automatically have mastery over their powers and must train themselves to properly use their new powers. The more the user understands their own capabilities, the greater the varieties of techniques the users can utilize" I also found "Different people take different amounts of time to master their powers. For example, Luffy spent years learning how to use the Gomu Gomu no Mi, whereas Kalifa and Kaku only took hours" But I see what you are saying as it goes on to say "Proficiency also relates to the user's stamina. When exhausted, one cannot use their powers properly and must rest to regain their strength". Again while I see what you are saying, Eiko hasn't used his devil fruit to the point of exhaustion in a chapter. Meaning he hasn't lost his ability to control gravity. As for weight, the above quotes state that power comes from the practice of the fruit. I do see what you mean about the stamina being needed and in big fights later on will show up.

Not yet, as opening the Sharingan requires a strong emotion to trigger it. And he hasn't met such requirements yet. Something might happen during the Chunin exam though. Enjoy reading!

I'm having to much fun writing this, it's never getting dropped.

Not gonna lie, I completely forgot about that. I added it into class ranking (part-1). Thanks for reminding me about that!

next chapter don't worry.

I was thinking Shizune.

I'm not gonna have him as an expert of the 8 Gates but as a little backup plan for when he needs a little more Taijutsu fighting power. He'll never open beyond the 5th as the 6th gate requires serious dedication to the physique.

No harem but yes there will be a tad bit of romance.

I didn't think about that, my bad. I'll try to remember those details in the future but I added a little more to that part. Thanks for the catch!