User blog comment:Aranryanchampion/Overall Update 3-1-2015/@comment-5657903-20150301130959/@comment-7200907-20150301132253

This is what hapened:

Since Rosa and Fiona were characters made by Steven Star, I thought I would ask him what characters he would like to replace them with. So he directed me to his Top 350 favorite characters list.

I am not kidding...

So I Went through like a quarter (was to lazy to go through the whole thing) of the list and picked out the female characters from it. While keeping my own rule list and what the others are going to make in mind. The list started at 40, but now it is down to TWO.

Then I asked Steven if these two ladies would Count as Empty Slot characters or my choices and he said they counted as the later.

So to answer your question, I chose the females myself.