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Over a decade ago I was a county therapist in Klamath Falls, Oregon, and had a number of intakes and clients who had dissociative disorders.
I quit that job but maintained contact with one of my old clients, a woman in her forties, who I'll call Susan.
Susan was extremely bright and competent in her work in editorial positions and computers, having returned to get a degree in computer science when her children were grown. How she got stuck in K Falls was a misfortune, but she was making her way through life despite being in a classic state of MPD.
She had been sexually traumatized at age two. Coming out of this experience she sought safety in a persona that wasn't scared of anything, and definitely wasn't going to allow "it" to happen again. In textbook studies, this personality is known as the Protector. The Protector wields a double-edged sword however, and he or she often will become a resentful, vengeful Persecutor toward the original abuse sufferer. There are sometimes other personas who deal with developmental challenges such as dating, helping with housework, and even repairing cars, but the Protector can be both the cop and the wild child of the MPD system.
I'll call Susan's Persecutor Dixie.
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http://www.dailykos.com/story/2009/11/21/805731/-Treating-A-Dissociative-Disorder-with-Marijuana