I'm only on chapter 18ish currently. I've kinda just been pairing up whoever looked sensible and went with banging Chrom's sister haha.
I went casual because the perma-death seemed scary as *** to start out with. I'll probably replay it the real way and take it more seriously while questioning every move I make in fear of somebody important dying lol.
I hit the chapter where Chrom got married my first time, and was not happy with it and started looking things up on how to change that. That was when I found out about inhereted skills and optimal combos for getting people skills they otherwise cant etc etc. Started over and still working on it.
Unfortunately, and I don't know why, Legend of Legacy is taking up my DS time lately. It is TOO RNG and really dead for plot, but the main character I picked has huge boobs and a low cut top so yeah.