On the same way of Lann, I want to post my impressions and the ones of my higher level friends.
Again these details are not tested yet in XE, so take them as something NOT FINAL.
FIONA -> Either hammer or sword are both very balanced chars, strong in SOLO and strong in a party. At low leves she might feel very weak and slow but once you manage to get all the skills and, on top of that, the parry skills, she becomes a beautiful and fun char. I believe she is the only char that can really solo all the bosses in this world, because as long as the shield stand, no one will drain your life. In SOLO dungeons there are no advices to give, just parry and atk untill the shield break. Well, when that happens, you're in trouble.
When in party, same exact things, parry n slash. When doing a RAID try to keep the aggro by standing close to the boss, stay on guard because the AGGRO in this game is RANDOM, with a privilege for who is nearear the boss. Even if she seems to not doing much dmg don't worry, on higher lvls you will be the one doing the most, because she is the only char that can stand face to face to the boss without being oneshot killed.
In the end, you are a TANKER and also DPS during the RAIDS. One plus point for this char is the possibility to use the Chain Hooks, a secondary weapon that you will need to win against some bosses and useful against others as it "stun" the boss for 6-7 sec (it depends on the specific boss and the amount of chain hooks you need to use at the same time to get him down). Focus on defence, the more you have, the more you last. Wear plate armors as soon as possible.