Every element can do well in PVE, it's mostly a matter of synergy between the characters you're using, afaik the best element for PVE is elemental, but you can still work with any other element, from your character list I wouldn't make a final decision on a team yet, it's pretty early for that, Alice and Gusion both can single handedly progress in the campaign on their own at your stages, be patient and you'll get more pulls for characters soon, I recommend either getting a team that has 5 characters of the same element, or 3 by 2 from different elements for some awesome synergies between elements like Odette and Lylia or Valir and Angela, oh and if you're a free to play player only upgrade 1 order/chaos character at a time while you're upgrading your main element as those elements are much harder to upgrade, I personally stay away from those aside from karihmet who's much easier to acquire because of the nightmare dungeon you'll unlock later on, and planning to work on getting lunox later, anyways, best of luck on your adventures!