I agree with others in the thread who've said FEH overall has great quality voice acting, but my favorites...
Kyle McCarley's Soren is extra top notch. I think it captures his personality perfectly.
Brianna Knickbocker's Ninian is so soft and calm. Her attack voice clips are so cute too!
Misty Lee packed a ton of matronly power into Titania. If only I could sound half as cool... ;w;
Richard Epcar made Oliver too perfect for words.