It would be nice to have 'folders' of sorts for our characters so that we could put all of the secondary ones together, and the mains in a folder, and villains, etc.
YES! I have a ton of characters in one of my worlds, and not all of them are involved in the same story. Folders would be nice, although it might also be nice to just categorize them with tags so that you can filter them as needed. Like, by role, family, alignment, story, age, magic/powers/abilities, etc. Maybe locations and timelines if we get a map or timeline-maker feature.
Actually, it would be handy to have that feature in every page type, not just characters. Filter towns by country, deities by religion, buildings by town or type, creatures and floras by their classifications or habitats, technology by its type/function, etc. As worlds grow, the list of pages gets longer, and it takes longer to find the page you're looking for, and scrolling for ages can get annoying. Being able to categorize pages further than just basic page type would be very nice.