in fe13 i use Sumia a lot, since i love her and for some reason cordy doesn't turn out spectacular when i get her (i still use her too though - pegasus knights for the win)
in fe8 i use lute a lot too - even though her personality can be aggravating sometimes, her design is cute and she's turning out okay. i use her over artur um
i use rhajat in fe14 irregardless of her mother, too. i don't know why, she just seems to be powerful when i get her and i'll take a powerful unit any day haha.