Thread:G-Monster/@comment-27004218-20170412202445/@comment-27004218-20170413093449

Those characters are, indeed, major. But they are in categories that are part of the Major Characters category.

Corvo is definitely a major character, but he is in the loyalists category. If you see the categories of that page, you can see that it's part of the Major Characters category. So, while not directly listed, Corvo still belongs to the Major Characters, if that makes sense.