Personally I'm a
-Sigurd/Diedre (duh)
-Holyn/Briggid (MANLY FAVAL [he only gets pursuit though] and Patty gets Lunar hit, which is nice)
-Midir/Aideen (Decent kids. Not spectacular nor specialized, but decent for a 1st timer. The pairing is also relatively easy to make too.)
-Lex/Aira (So you miss major Odo, but not like you're going to use the Balmunk without the glitch anyway. Skasaha and Lakche get nice durability)
-Levin/Fury (Just because Tiltyu died. ;_; Then I would go Levin/Tiltyu for Holsety on Arthur in chapter 6. :D)
-Cuan/Ethlin(duh)
-Fin/Lachesis(It's a hard paring to make, as Fin and Lachesis only spend 2 chapters together. if you're already on the road of chapter 2, I recommend to skip this pairing. Delmud and Nanna both get prayer, which is nice, but you should probably look in to Beowulf/Lachesis)
I think that's it for the 1st gen.
I've only gone through Fe4 once, so maybe you should go inquire the Fe4 thread too. XD