It has been speculated that the only permanently/long-term useful elemental buff skill is Wind Walk.
Fire Enchant - WOO, fixed bonus damage! +50~100 damage when you do 3000 is oh so helpful.
Ice Shield - WOO, the enemies slow down! But who cares, they should be dying fast enough that it doesn't matter.
Stone Armor - Semi-useful. Reduces damage by a fixed amount ... but then subtracting 20~70 damage from 500 doesn't really help you.
And of course, you should be aware that a single character cannot be affected by more than one elemental buff at the same time.
... so that brings me to Wind Walk.
+70% Movement Speed means you move faster and thus reach the next monster quicker, more speed makes it easy to maneuver when training/bossing and this will always be useful until the end of time.
In short, all other elemental buffs are useful in the early stages of the game. In the long run, Wind Walk.
Hope that helped... or something...
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LaTale @ Iris
yaeka | 155 | Dagger Treasure Hunter | Little Templar
IchigoParfait | 145 | Power Blader | Valkyrie Schoolgirl