I've been thinking for a while and I'm stuck between two approaches:
One of them is to put everything inside one datastore. This would make my request to the datastore in just one line, but I'm afraid that I would overload my datastore quickly. And it would be easier to manipulate it.
My second approach is to make multiple datastores – Character Stats, Character Customization, Inventory, Skills –, but by making this I'm afraid that the requests might be slower or something like that. Not to mention that it would be a bit harder to manipulate the data.