This really does seem super cool so far, but I am worried about the giant thing going forward. What are the logistics here, what does the giant sister eat and where does she sleep? What are her clothes made out of? If she defecated in a river that would be enough to poison everyone downstream for a good while. Why isn't she actively driven away on account of her walking anywhere would completely destroy any road they built? Etc.
These are just some examples off the top of my head and maybe they're not that great, but the point is that at least some of these kinds of points will be addressed in this series and imo that seems a bit pointless. Like why not have her just be of some race/tribe that isn't gigantic but still has whatever other traits and culture that is ascribed to the giants here and avoid all of that?