Felicia is the unit I've been putting the most effort into. I have an Ike, Hector, and Azura on my team, and I was looking for an answer to mages. I found a + Res / - Def Felicia, added spur attack and rogue dagger, and she does her job well. I'd like to add Celica's A Skill to her, but the chances of getting her are too low at the moment.
I'd also like a Faye, or other unit with a firesweep bow, but I'm going to wait for her rarity to drop