Hi there!
Don't worry, I was wondering about the Junior Evil Minion thing too when I first started. I'm guessing it refers to a minion of the 1xR Brigade, of which Rose is the leader. But those crazy titles made up by Rose are actually your rank, used to "indicate the number of posts you have made and to identify certain users, e.g. moderators and administrators may have a special rank." (taken from the faq). Your rank changes depending on number of posts...I think once you get to 50 posts, you'll have your first change. I think the rank titles are just supposed to increase in coolness as a way to identify those who have contributed a lot of posts in the forum.
Hope this helps. Happy posting!
~Sphinx