They picked the right people for this, but I'm not as familiar with Yunalesca as a character? Gwen would be trying to appeal to her humanity, but is that the wrong kind of tactic to take?

Either way, Gwen is a Magiteck Knight/Gunner, can use all the Gunner abilities through her gunblade, I'd never thought of this, but it's a pretty good combo when I look at it.