Should we just turn the folders on this page into redirects? The way Season 4 is looking, it seems that Marinette and Adrien's entire class are going to be Miraculous users, and since it's against policy to spoiler folder names, I think it would be more spoiler-friendly to have folders named for the heroes and then have a redirect in them with their civilian names spoiled out, as well as imply a more temporary usage of the Miraculouses.
For example, instead of:
Alya Cesaire (Rena Rouge)
Kagami Tsurugi/Ryuko
...we instead have:
Alya Cesaire (Rena Rouge)
Kagami Tsurugi (Ryuko)
I like your idea for the folders' names, but won't it be better to add their respective folders in Characters.Miraculous Ladybug School Characters and Characters.Miraculous Ladybug Assorted Civilians and have them redirect here so that those pages won't get cluttered? Like so:
Alya Cesaire (Rena Rouge)
[redirected from her entry in Characters.Miraculous Ladybug School Characters]
Kagami Tsurugi (Ryuko)
[redirected from her entry in Characters.Miraculous Ladybug Assorted Civilians]
After the conclusion of Season 5, since everyone has their Miraculous back on a permanent basis, I feel like we should make character specific pages for each of the heroes.