To punish that personality it will often harm the body of the person, not realizing it is hurting itself in the process. A final common personality is the Protector personality. It is created to give a feeling of protection to the child personalities and to try to prevent the Persecutor from lashing out at others or itself. These are obviously not all the personalities, found, but they are the most common. Due to all these conflicting interests the personalities often argue with each other.
Many people dispute the existence of multiple personalities.
They argue that such an idea is impossible and that the people are simply making it up. However, I believe the opposite, and many people share my opinion due to one study. Around 10 years ago a Dr. Putnam conducted an experiment, whereby he hooked several MPD sufferers up to a machine that measures brain waves. He then subjected each personality of each person to a set of stimuli. Each personality reacted differently, the difference was around the same as between two separate people.