Just some explanation on some things.
Why every fashion is possible.
The main reason for this is because when fashion was redeveloped in their world, each area and species adapted to different kinds and types based on the old world fashion. This means that most cities have a particular fashion style, and thus, if you dress in that style, you are assumed to be a part of that area of settlement. The only exception to this is in areas with a large, mixed population, and adventurers themselves dress however they want, and sometimes based it off a motif. Unity Town is an example of an area where there is a huge area where people dress in many different ways.
Why There are more human sapients than any other.
Its because humans, as sapients, have been around longer than any other, giving them more time to evolve and diverge. Also, humans have always been all over the world, so when the original society crumbled and the planet went under extreme geographical change, it gave virtually all the old world humans a chance to evolve into new species, in order to adapt to their new environment without technology. The other creatures that became sapient just evolved along with humans.
Why, and how, humans/sapients gained "Spirit Power."
For humans and relatives, it came from their original development of old world humans. Old world humans had to try extremely hard to keep in tune with it, and HAD to it with their spiritual energy artificially in the form of things such as through religion, and rituals and such. Furthermore, it was very limited to only the luckiest and most spiritual of people (mostly to priests, prophets, and similar religious peoples.) The interpretation of it being of other source was an attempt to explain how it, and the things around them, worked. Science at the time, wasnt advanced, or specific, enough to directly observe it. As a bonus, they denied its existence, so real, proper, and extensive research was never done. Creatures, many years later, all had a chance to develop spirit power in addition to the various new forms. Humans were possibly the first to make spiritual power a normal, possible, and explainable thing, instead and selective, supernatural, and rare one. Basically, everything else followed behind on this in order to adapt.
Why there are, technically, no races.
This one is pretty simple, really. First of all, human "races" integrated basically into one society, making the terms invalid now anyway. The "race" aspect of humans, however, is present in most other human species in other ways (such as varied skin tones, and other varied traits.) Secondly, the never redeveloped the concept into society. It dosent mean discrimination is nonexist, just not in the form of "racism."
Whats the universal language?
English, and I didnt choose it just because its the only language I know. English is the most common language on Earth, and the most used, hence, when society was remade, English caught on. The other languages exist, such as French, Spanish, etc. as evident by things like names, but English is THE language. Id be considered weird to NOT know English.
Why did I go with "Fantasy Kitchen Sink" setting?
It shouldnt be taken literally which is what those mean critics probably took literally, I probably should have been more elaborate. All the creatures are simply named after what they look like, rather than actually being that thing. An angel, for example, arent literally angels from heaven, they are named so because they look like they have the stereotypical feathery wings on their backs. They are all physical creatures with finite lifespans. This term was just the quickest thing to explain the creatures in my series.
Why did I make everything "Spirit Power" instead of traditional "magic" or "mana."
I did it to be different. Yes, really. Also, "your spirit" is generally more acceptable and more universal than magic. In a word, its fits more easily with more beliefs and ideals than magic does. Also, it has a sort of hidden meaning. I want you to think about that.
Whats with so many elements, and why are they called "attributes."
Again, it was to be different. I like elements, they're cool. Its also based off an inner desire for Pokemon to add more types, hence why they work like Pokemon types as well. I really dont want them to add the ones I have, its just based off that desire. The reason they're called "attributes" is a similar reason as to why "spirit power" is the source of power instead of magic. The association with "elements" and "magic" is too strong. Also, not every religion believe in elements, and not all the attributes are even real "elements" to begin with (what kind of "element" is Mutant?) Finally, like the concept of your "spirit," the name use of "attribute" as well as the attributes themselves, have a hidden meaning as well I want people to think about.
There are more, but I cant think right now, so I'll add them at other times.