User blog comment:Vitalius/The return of Oración Seis and Crime Sorcière/@comment-4829046-20131022143015/@comment-7418318-20131023155812

That theory, if it holds true, would leave Wendy with pretty much all possibilities.


 * Lightning: Air is a very bad conductor, so no backlashes here. Massive speed boost (lightning plus her speed buff) and more attack power, though otherwise little synergy.
 * Fire: Fire needs air to burn, so using her air abilities in conjunction with fire could unleash some very devastating firestorms. And she could also use her wind to better control the flames and thus avoid unnecessary collateral damage or increase the effect of the flames, by making sure they concentrate fully on the target rather than splashing all over the place.
 * Iron: Air has pretty much nothing to do with Iron, so no problems here. She could use her air to make any iron projectile fly faster, or catch fragments in a whirlwind and shred the enemy with it, so they even got some synergy for the attacks. Also a nice defensive boost.

Going outside of Fairy Tail:
 * Poison: She could use her air to make the poison clouds move as she pleases, which sounds very useful.
 * Light: Nice boost for her attack power and maybe the ability to blind the enemy or restrict their movement with that stigma.
 * Shadow: Not all that much more offensive than her sky DS, but better chances to dodge attacks (by diving into the shadows) and mobility. Pretty nice perks for a supporter.

Pretty hard to decide which one would be the most useful as a secondary element for our little Sky Dragon Slayer. Though as far as pure destructive powers go, I think Flames might be the best choice.