Wow...that was a long break between chapters. In fact, it was over....well, we don't need to go there. I have a little bit of time to write in my schedule, and I still have all my old notes to go off of. I know some of you may have moved on in all that time (again, my fault), but for those of you who still come to the wiki, here's my latest chapter: Solo Mission!
I have deleted those categories 1. because they were empty, and 2. because we're in the long-term process of revising the category-system, which would lead to the deletion of all those comic specific categories in favor of more general graphic novel categories.
That said, please know that just because you find something to be "highly necessary and vital", that the rest of the community is of the same opinion, and generally speaking, when a page has been deleted before, the opinion is that such a page/category wasn't needed.
Even if I wanted to restor those categories, I couldn't. I do not have the ability to do so. If you do not know why a page (or, in this instance, a category) was deleted, the best course of action IMO is to ask whoever deleted the page/category why they did so, and they can tell you.