User blog comment:Miskos3/Fairy Tail Chapter 326: Natsu vs. Rogue, Review/@comment-203.87.139.100-20130405155943/@comment-7418318-20130405164351

While I really don't think he's in the story anymore, Kageyama of Eisenwald was able to do it, though he didn't show any aptitude for possesion or mind controll.

Zeref or one of his demons might be able to.

Rusty rose's magic arc of embodiment migth enable him to do it.

One of those coming dragons might be a shadow dragon and have been sent as an advanced scout (and due to some relation with Metallicana decided to play a bit with Gajeel).

Also the shadow that left Rogue's body might not be the actual person, but some kind of medium through which the possesion spell was cast.

And there's always the possibility of a not yet revealed character, or a not yet revealed ability of a known character.