That's my story series I'm writing offline currently (kind of). I call it "(Different subtitle for each book) Paradesio" . It has 5 books right now minimum, and I'm planning to expand even more. :D
It's my favorite thing in stories when its all original, with original characters, and the world is so vast and expansive that it can inspire all kinds of fanfic of that universe because everything is so clearly visible within another person's imagination, almost able to draw a map if they wanted. It's fun and writing should be fun! Like D&D, or an anime fanfic. how the world is there. It just needs characters to be part of it. It's like the biggest sign of "you did a good job" creating a universe. I dream about having the universe I create to be that for someone else. It'd be the ultimate feeling.
I imagine not every book will be read by every single reader, but I think that's where my own stories will differ slightly than most series. I'd want and prefer someone to be able to pick up a random number in the series, and just enjoy that book for what it is, but as they read other books, they start seeing the bigger plot unraveling in front of them.
the first is about the setup, and the universe with the reasons of why things are they way they are.
the following will be within certain cities or countries, showing the cultures and their own way of life. powers, and technologies.
the last will be centered around a land mass separate from any of the other countries where things tie together, and where all our MCs end up together. some MC's will fight, others will become companions, some might even become friends or love interests.
I think because of the massive web of plots, needing to tie things into each other, it could seem messy, but I've also been plotting ideas and concepts for a few years now. It's... really all i do. I enjoy writing, I'm just still learning how to write what's stuck in my notes, and drilled within my own head. There's also.. WAY too many antagonists, and problems. much like the real world, some things just can't be dealt with. Some evils just exist, and that's it; fight, and argue, and bite, and claw, there's always something. -I leave that in my stories. I don't think happily ever afters truly exist. So I won't ever write one.
I personally love some of my antagonists. Some of my most evil characters can't be beat. Not because they're unkillable, or morally, spiritually, or politically correct in any way or form. It's not because they're strong or elusive, sometimes evil just sits there in front of you, and they grin, and smile, and wait. -and you can't do anything, but you know.. something is wrong. and yet here they are, petting a cat, and talking sweetly, and cordially to the old lady in the corner. I love those kinds of bad guys.
I know ALL I did was ramble and yap and literally say nothing here. But I don't want to spoil what I'm working on. I'm very VERY afraid people won't enjoy it or question it, and I'm just not ready to share yet. Although I'm extremely proud of the project and the ideas and the concepts, it's fragile. and I know it is. I don't want to see it ruined before its ready. I genuinely do love these characters though. I hope when I think its ready everyone else will too.