User blog comment:Shorya/Strongest Character in Fairy Tail/@comment-3441749-20151207083853

I'm guessing Ankhseram is mostly likely the most powerful. It seems to be omniscient, able to know when people are doing things. And seeing as it was able to inflict such a horrible curse twice just because it was angry, I'd say this is one deity that Natsu can't one shot.

Aside from Ankhseram, it could be E.N.D., since even Acnologia seemed at least wary of him. E.N.D. also was implied to be able to fight on par with Igneel at one point.

Mavis honestly never struck me as a person whose talent really lay in power. Her primary weapon seems to be her mind, which of course is unequaled. She sought to win a battle before it was fought.