On Hoshido:
Oboro, 'cause he would probably be the successor to the oft-maligned Soldier class
Linca, because of her design and finally a Female Axe(-ish) user
Saizou, he looks pretty cool.
On Nohr:
Garon, not sure if I'm the only one, but he could really be a nice change of pace for kings of nations like Nohr being evil
Gunter, I'm a sucker for old bad-asses, plus he's a nice change of pace for the mainly (in my estimation) 15-mid-30's that the Fire Emblem army has been, I will make him amazing
The Blonde Guy, forget it, can I call him Bob the Hero? I will, he looks awesome, I hope he ends up as a jovial sort who acts so to raise the morale of those around him
Camilla, good Aversa could be cool, no other reason, none at all.
Personally, I have the feeling I may prefer the Nohr characters, but eh, que sera.