My current party for EO IV is Bushi/Nightseeker and Fortress/Landsknecht in the front with a Runemaster/Imperial, Medic/Runemaster, and Sniper/Arcanist in the back. Added defenses to the Fortress, with a Bushi spamming the hell out of her elemental and normal attacks. Sniper for binds and damage, Medic taking care of elemental defences along with healing and status removal, throw out a Runemaster simply to spread damage around as well.

I found my issue with links were mostly the single target nature of them, which is perfectly fine for FoE's and solo bosses. But some needed a deal more AoE going on, which the Bushi has in spades, along with her massive damage with charges and the like.

Persona Q is on my list of games to try, but need to get it first.