Yes, the GBA ones are excellent. Especially for introducing people to the genre. It always amused me how they stripped down those games to the bare basics of Fire Emblem. I didn't notice before, until I played 4 and 5.
So, let's see. Any god units you've have? Apart from Ike/Hector.
Every falco knight in every game I've played becomes freaking nuts. Mist gets crazy good at higher levels with a good sword. Ewan in any form is a 1 stop shop for face ****.