I ended up using all of my stat boosters on Leif on my first playthrough, and I mostly lured out the enemy units to prevent anyone from dying.
The units in FE4's last three chapters are a major nuisance. I'll be the first to say that chapters 6, 7, and 8 are pushovers with the right pairings, but the Lopto mages in 10 and Endgame made me change how I played completely. Your units in FE4 will always be better than the enemy, and this is proven by how the game can be played without being at major risk of losing a character. In Gen 1, you can leave one or two of your units in front of a group of 3-8 guys, and they all just drop dead in a single enemy phase, the exception being Chapter 3's Cross Knights and the part with Tailtu, Claud, and Bridget. In Gen 2, you can do the same until the enemy decides to take things seriously and not just gather around Ced, who's standing on a forest tile with Forseti. The Hel tome is inaccurate, but it drops your 80 health to a one. At that point onwards, rushing the enemy is no longer a viable strategy, and the rest pf the game is like fighting Cross Knights.
Forgot about Meg XD. Brom would be ashamed after seeing her base stats.