This character is, of course, your reader. You should get to know them – at least in theory. You seem to know what sort of reader you want but can you learn (or work out) more about them? What are the reader’s needs? what do they look for? What unanswered questions can you address? Where do they go looking for the sort of information you provide?
When you have in mind your “hidden character” (reader) and actively satisfy whatever itch that sort of reader has that needs scratching, diffusion should do the rest for you. Literally amaze, please, and satisfy your readers and they will share with other people like them.