Well, my necromancer character will at least start out guildless, but will either join Fairy Tail or a similar legitimate guild, so she'll qualify as a "good guy."
Besides a few villain ideas floating in my head that I'm going to side for now since we've got a good dark guild, I've got a few other possible protagonists, but they'd all be low-ranking, and I just want to know if I should be thinking of a headmaster or S-class mage for Fairy Tail too.