User blog comment:Unrulyruby100/Hey look! Policy updates! Categorization and image sourcing/@comment-23828362-20140125033437/@comment-27202257-20140125034636

If you look at the Major Characters category, you can see that Assassination Targets is one of its subcategories. Effectively, it says that all characters in that category are major characters, so there's no reason to list them twice.