In my opinion it has solid world and character development shown throughout the whole 388 chapters, I have read this far. Even "Nobody"-Backgroundcharakters sometimes get their moments and their background is explained which at first seemed overdoing it but after so many chapters I get to enjoy every last bit of world background, charakter development and every background story, no matter if about our beloved mc, the world, some sidecharakter or one of the friends of the protagonist. There are some mistaked and evey now and then the measurements don't make that much of a sense, because in the beginning it was switching between them every now and then, but for the last few chapters I did not find anything like that so, even that got solved :)
