Suspects
Lucy:a celestial wizard. Didn't have motive
Natsu: fire Dragon slayer. Motives: he hates her dark side
Gray:ice wizard motives: Mirajane used to set Gray up with Juvia
Erza: requip wizard motives: Erza thought that Mirajane was in charge, and she hated that idea
Happy: Natsu's friend motive:
Hates everyone except Natsu
You: water wizard motive: she liked your crush, Natsu
Juvia: water wizard: Mirajane loved Gray, which Juvia hated.