User blog comment:Starofstar/Confusion/@comment-10380701-20140414155305

Both. But backstory is top priority.

As you develop the backstory, relate it with their capabilities. Let's say Person A wanted to become a fencer and trained in Style B because her parents got killed. Or let's say Person B comes from a line of badass Dust users and she happens to be a prodigy/failure in comparison to the rest of her familiy.

Lots of potential there. You just need to set your character in stone, before you polish them.