Fir, because she's karla's daughter. I also get her supports for bartre or karel every time, despite the fact that karel joins super late. Just because I love that family.
Oh and in fe7 I always try to get karel every time, honestly one of my favorite units, despite being told that Harken is a great unit. Played this game so many times, never gotten Harken once.
Sword saint and sword demon are just really cool titles, i need those in my team.