For PvE like questing and solo training, I personally think Xao is always good because of her wall which comes in really useful in quests in avoiding damage, but some might say Kanako or Elin besides, well, Fred. :)
Hope it helped!
Lu
"Back in my Virgo days, bursting didn't exist!"
RIP WLO, truly an iconic game that started my MMORPG love.
Looking to play the Chinese version.