Now that I've seen most of hard mode, I feel ready to share my favorite party.
Ramas (A+): He really is the answer to all you could wish for in a frontliner. With the right equipment this dwarf just cannot be killed. The only character you can get immune to everything. Well, except elemental damage. And offensively he is second only to Loren among the fighters.
Recommended skills: Crushing Blow 3, Push 1+, Rage 3, Toughness 3, Willpower 3
Loren (B+): Her damage output is extraordinary.
Recommended skills: Dual Wield 3, Knock Down 3, Push 1+, Rally 1, Toughness 3, Ward 3
Saren/Elenor Fighter (D): His/Her Hero skills are useful from time to time, most times it boils down to heal, though. The same goes for the standard Fighter branch. Well you cannot kick the main character now, can you...
Recommended skills: Life 3, Neutralize 1+, Push 1+, Toughness 3, Ward 3
Saren/Elenor Thief (E): The standard thief skills are not worth it. Not able to stand in the front he/she just crowds the backrow :/
Recommended skills: Life 3, Neutralize 1+, Ward 3
Dora (B+): Pinning shot and snipe rules. A pity some enemies (even standard ones) are virtually immune to stagger, so no pinning them. Capable of much damage nonetheless.
Recommended skills: Pinning Shot 3, Sneak Attack 1+, Snipe 3
Draco (B): Best Mage you have available. Since Mages are best when they don't cast damage spells. In that aspect he's unquestionable ahead of the other mages.
Recommended skills: Clarity 3, Cure 1, Haste 3, Phantom Form 3
Myrth (C+): It's mainly about her other virtues
Recommended skills: Clarity 3, Cure 1, Haste 3, Nature's Touch 3, Tangling Weeds 3
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Those that didn't make it into the team:
Amukiki (B): Ramas immunities are superior to anything Amu has to offer.
Apolimesho (C+): He's pretty much comparable to Myrth in any aspect but one
Rei (B): Best thing is his immunities. All in all, Dora has a tiny few tricks more at her disposal.
Karen (B+): Her Death Blow is inferior to Doras snipe; Leg Break isn't as good as pinning shot. But Focus Target and especially Whirlwind is quite strong.