They're zoning, trapping, and space control characters so of course their stamina will be a bit low, and defense will be mediocre at best with risky escape options. But they make up for it in frustrating, and pressuring the opponent into thinking twice about pressing a button. Yukiko has a healing ability, that if not block she pushes away her opponent and won't need to use bursts or counter assaults for escapes.
Labrys, you have to build up her damage overtime. It's like this: the more times she hits her opponent the more damage she'll do, but her benefits gets lost overtime if you're hitting your opponent constantly.
This is Kanji:
The guy with the black hair and glasses in the vid above, that was him, but in a more "professional" looking way.