Refia - Golden Staff, Force Shield, Soul Crown, Red Robe, Muscle Belt 2x, Dual Cast, Equip Shield, 20% MP, 15% HP
Cecil - Survival Edge, Aegis Shield, Grand Helm, Force Armor, Muscle Belt, Defender Bracer, Guardian Authority 2x, HP 15%, HP 10%.
Snow - The knuckle with Wind, Snowshield, Green Beret, Black Belt, Muscle Belt, Ruler Ring, 10%HPs, 15% ATK, etc.
Ling - Creepy Mask, White Robe, Orichalcum(Had no other weapon), Ruler Ring, Vital App, 15% HP, 20%MP, 20%MP, 10%HP.
Basically, I just built with HP and MP in mind. The only damage I had going was my Noctis. Snow was just attack with AquaStrike the entire time.
From the units above, I had 3 TMs in use, with only DC being required.
You could always replace Snow with Buttz if you have trident or Buttz with Ling if you want to rely on a direct fill. I needed to use two Elixirs for Noctis and Refia, since around 40%, they were broke. Where either Cecil or Ling did it.