Good news - I have built an EXCLUDE filter for Characters now, and it’s ready to use, although I do want to do some updates to it.
As it’s just a test for now, it’s not shown by default - go down to “More Filters Available”, tick “Exclude Characters”, and hit add. It will remain active on your login for the next 12 hours. (Side note: I’m going to build a way for people to pick and choose which filters to show, in their profile).
Because I’m limited to how my system works, it appears a bit differently than AO3. Instead of showing how many items would be excluded if you select it, it shows how many items will remain from you selecting it, so it may appear backwards to you. Also, it shows all characters, even ones that aren’t included to exclude! A bit confusing.
As an example, here is a filtered view showing TV Stories featuring the Tenth Doctor, excluding ones with Rose Tyler in.
I’ll continue to update this and am planning to hopefully flip the numbers, so it works like AO3, and maybe hide a character from the list if selecting it won’t do anything.
(Oh and by the way this list is reduced down to prevent there being too many options - it only shows Doctors, Companions, and Main Villains. Oh, and I don’t think it works with hierarchical characters at the moment)