I really like Madelief, you really hit the nail on the head with the sense of adventure I'd like them to all share, that's why the Wolves worked together so well, they were all adventurous. Just one quick note, World War 1 hasn't happened in this world as of yet. The only wars that have happened in recent memory are colonial uprisings or the war between Portugal and Austria-Hungary over Spain's former colonies. 

Other than that it's perfect, I don't think the wing walking and shooting is too outlandish. The Wolves were all exceptional people after all. I'm fine with Wolfgang being the one who allowed Madelief to keep her plane, he can also be the one who taught her to fly if you like and if nobody else wants to fill that role. I think using her uncle as a potential protagonist would be good, we can see where we can fit him in as the story unfolds. 

I've not heard back from our fourth player so I may post a quick interest check over in the Advanced section to find another player to round the numbers out a bit, I'll give him until this evening to make an appearance before doing so. Looking forward to your CS gowia.