Agreeing with this i'd really love to have the ability to have them in more than one!
I'd really like an option to put a single character in two folders, like if a character has a feral and an anthro form, or something like that.
id really like a way to put one character in multiple folders without the use of split tabs (like the main profile for one character shows up in both folders) tbh! for example some of my ocs i have in my main characters folder but i'd also like them in a CS folder - i use tags for this currently but having a folder seems more like,, Noticeable