User blog comment:IamJakuhoRaikoben/Chapter 298: The Breathtaking Land of Ryuuzetsu, Review./@comment-4047931-20120908011511/@comment-3290324-20120908013020

I think Mavis's carefree personality is meant to be interpreted like Mira's and Erza's: for humors sake. All three Mages are intelligent, but its funny when they do "slow" or "stupid" things, but I think they've all proven they are nothing of the sort.