In my first playthrough, Chrom married a silly Maiden. Lucina barely had any role in a battle, she was just there to get support conversations with Chrom. I did get her Luna and Support Guard+ though.
My Avatar married Cordelia and Morgan became an offensive healing rally-master Trickster with Galeforce and Ignis. Severa became an Assassin with Lethality and Armsthrift.
Libra married Olivia and Inigo inherited Olivia's Luck+4 and I got him to become a Bow Knight with legendary weapons because he can never wear out a weapon's durability from his 50 Luck and Armsthrift. I made him get Sol just in case his 90% Avo ever failed.
Owain became the Paladin/Swordmaster hybrid with Astra, Aegis, and Vantage. Also with Miracle and Avo+10.
I neglected the others though. I promoted Laurent, Brady, Cynthia, Noire, Kjelle, Nah, Gerome once before completely forgetting about them. I might do something with Gerome and Nah though.