High cheekbo- mmmm titties....
anyways as I was going to say:
Melia has high damage output potential in bursts, but the AI (not just melia but all of the AI actually) is way too conservative, so the AI melia just summons....and doesn't discharge....she just fuckin sits there twiddling her thumbs not throwing anything or rarely. So, to get her utilized properly you have to:
1. gem her with +lightning dmg gems (don't bother with night vision because that's only auto attacks/physical arts, ether will almost always hit)
2. control her, summon agility first, then summon lightning and then copy. then discharge your two lightnings for absurd damage and watch (her get attacked unless you have aggro stealth gems and talents that reduce her aggro because aggro in this game is stupid, it's based on damage, not aggro amounts like say in WoW) her deal like absurd amounts of damage. if she has topple dmg+ gems as well this becomes even more absurd burst.
3. use spear break and starlight kick every chance you get, they can force a topple if they hit, then the AI will react immediately to topple status if they're not in the middle of something. Shulk generally never does the Daze attack simply because it inflicts daze on topple....so like a retard he never uses it, he saves it. However when it's toppled he'll use it immediately.
Those are her main traits. I find it fun to play a mage class. Just sit back and let them do all the work while I nuke the shit out of things