I've played and beat all 300 Missions on Normal, but I need one last slog for the final mission.
Here's one of my favorites:
Abilities:
Primary Class: Blue Mage
Secondary Class: Seer
Reaction: Counter
Support: Double Sword
Equipment:
Soulsaber
Soulsaber
Flame Robe
Orb of Minwu
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I call this the "Fire Recharge" set. Basically you can jump into a hoard of enemies and cast Magick Frenzy with Fira. You will deal immense damage while healing yourself. Additionally, any of your other units with Fire absorbing equipment can be healed. Finally, you can Magick Frenzy Recharge and heal both HP and MP. And of course, you have access to all the awesome Blue Magick spells. This is particularly helpful with White Wind since you can keep your HP at high levels while attacking foes. It's not as effective vs. Fire resistant, immune, or absorbing enemies, but you'll never be incapable of action on some level.
Also, properly trained Bangaa are broken as hell. Feast your eyes on this:
Recruit As: Master Monk
53 Levels Master Monk (Total) / 45 Levels Trickster
Expected ending stats (Base):
HP: 616
MP: 202
Speed: 140
Pow: 240 (960)
Def: 202 (808)
Mag: 242 (968)
Res: 191 (764)
To put this in perspective, the maximum base stat a unit can have is 150 in Speed and 250 in Pow/Def/Mag/Res. In short, this unit is extremely fast and can use any offensive or defensive ability. My favorite unit with this setup:
Abilities:
Primary Class: Trickster
Secondary Class: Gladiator
Reaction: Strikeback
Support: Unscarred
Equipment:
Joker
Bone Plate
Orb of Minwu
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This unit works best with MP Recovery support, namely Hunter/Soldiers with Rend MP equipped with Max's Outhbox or Gladiator/Warrior's equipped with Ebon Blade. Joker gives you an obscene 7 Range which you can use to deal massive damage ad knockback with Rush, but with that MP support you can unleash Ultimas for massive damage every round. Strikeback fends off basic melee attacks for anything that gets close. Additionally you can Snigger to Berserk close units, though you'd probably destroy then quicker with an attack.
I have a stat guide available in Excel format for anyone to make use of. It has Stat Bases, Stat Growths, common builds, and level planners.
Link