Sykar
Arcane
I would not say that 2-handed Fighter for her is strictly better than barbarian.
Heart of Ira is available early and removes fatigue from the Rage, plus Lethal Stance bonuses is huge, including crit multiplier with any weapon at lvl 16. She is not weapon bound this way so you can use Glaves or Endless War in the beginning and Greateaxe in last chapters. And has 3-4 levels for multiclassing.
Only thing that bugs me is the lack of Archetype - Mad Dog is ridiculously good.
Same with Jaethal too - vanilla Inq looks pathetic next to 3 cool archetypes available in the game.
I disagree. Barbarian gives her a lot of benefits to make her a skirmisher which charges all over the field to murderize squishy casters and bowmen. She achieves really high HP during rage, immunity to fear effects(with rage power), absurd damage and the damage reduction helps against the worst hits. Base rage is not even really that good, it is at its upgrade versions where it starts to shine starting with Tireless Rage. Going Lethal Stance also makes her a crit monster.
I never got the complaint that she is useless. She is good if utilized correctly. Figher does not fit her personality one bit. I would not mind her being an Invulnerable Rager though.