Females Morgan and corrin(flier)

Yup! With emblem buffs and a blade tome, Corrin is still a powerhouse :D

Corrin can definitely be made into a Bladetome unit, especially with her 34 base speed. Morgan can also be made into a Bladetome unit with Fury 3 (33), Hone Fliers (39), Speed +3 Seal (42) and, if you have Goad Fliers (46).

Both work with blade tomes, as with full flier buffs (or I guess just full visibile buffs not counting goads and whatnot) with a blade tome they both get 24 extra damage, so the -atk doesnt hurt too bad

I do use F!Morgan as my main blade tome nuker, she is awesome with +spd iv and death blow, but she is -atk iv. I have one goad on Micalis for further support, so she hits 33 +6 +4 = 43 spd total. You can substitude a slot skil with fury 3 or LnD, depends on how you plan to use her.
In my eyes FMorgan has more versatility when it comes to builds than S!Corrin, simply because she can be baiter and ranged nuker at the same time.
For Corrin you need LnD and blade tome, buff her, and i guess she will serve you just fine, just because she is glass cannon by default, she does her role better than Morgan.