The character creator in my game would use all the assets I purchased of course, otherwise what would be the point to purchasing them right? BUT the tool ( code name: character maker thing for game maker) would only have some of the characters I made in character creator 2d in it as "samples". my tool is based off characters created in character creator 2d (final colorized exports) so in order for someone to make character assets for it, they would have to buy Character Creator 2D and if they wanted more options. Extend their library further by buying DLC for character creator 2D =). My tool will also use spine as it's animation engine, but the assets you create with my tool to use in your project does not allow you to create bone animations for it. for that you would have to buy a spine license.
I'm basically putting my tool behind a Character Creator 2D and Spine pay wall if they would like to extend it's functionality.
As for the plans for the next update, I'm sure it will be awesome. I look forward to it!