I think that a few of them wouldn't really have spectacular lives without the war to shock them into action.
Rachel would probably just become a cut throat lawyer and that would be enough thrill for her
Cassie would work as a vet, duh
Marco would start his own business somehow, and become a millionare
Tobias would prob run away from his uncles eventually, maybe he'd join the army, it would give him that sense of belonging and he'd be the kind of kid they'd be looking for
Jake would probably be some kind of middle management desk worker, he never really had any big aspirations so he wouldnt really be jockeying for any promotions, they would just come with years of steady work and he'd get the nice family he wanted
Ax would prob make it to some kind of high rank, but really only because of Elfangor, hes way too afraid to take risks and question authority to really get very far on his own, he only became a great prince after the war because of everythng the war taught him, without those experiences...