Wolfox

Why Lodestar? Their Magic cap (26) is a lower than even some other sword using classes. Swordmaster/Hoshido Noble cap at 28, and Dark Knight/Nohr Noble at 31. While the noble classes are a little tricky to get many of units into because their parent must have married Corrin, Swordmaster and Dark Knight should be easily obtainable goals for most through Partner and Friendship Seals. 

well, the reason is because I have little other use for the Lodestar since my main male swordsman, Hisame, is much better as a Swordsmaster Agility tank.

well yeah, but Lodestar is just kinda a poor magical class, so it might not live up to expectations and another sword wielding class would likely work better. Lodestar is also very similar to a dodge tank, so once again, another class might function a little better there. granted, these are children units, so given enough seals and investment, they can basically do anything. just my two cents on the matter.