arranging Player List
They'll show all together under The Cast, as it recognizes special characters. I used an underscore _ to begin each character's name for a second group so that they'd all wind up together.
However, the special character is ignored on the Character Details list and at the bottom of the Post a Reply window. In those two cases, they are listed alphabetically as if the special character isn't there.
The other control you have is the Group Setting. If I'm not ready to delete a character, for whatever reason, I changed its Group setting to U, so it's around, just doesn't show up to others, except under The Cast list.
If want these players to be able to read all posts, then they have to have access to all Groups. If you want them to not view certain threads, they change those threads to a Group the Missing Players don't have access to.