Alternate Personality Harry

I was reading some random dark Harry fic while watching the movie "Fight Club." I know a story has already been done about Harry starting a fight club, but I'm going for a different approach.

Harry develops a different personality like Tyler Durden in the movie. When Harry goes to sleep or passes out he often becomes this person. He won't know what he is doing, so when people start looking at him with a scared expression and avoid him. He will think it was just because of Voldemort.

Rules

1. Harry's alternate personality must cause chaos in the Ministry/Hogwarts.
2. Harry must not find out about this personality for a while or he could see this person like a whole different man like in "Fight Club." Perhaps he thinks he is an exhange student.
3. Harry will not join Voldemort.
4. Harry can get followers, but it is not necessarry.
5. When Harry does find out he must try to fight himself to gain control.


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Doesn't really sound particularly enthraling, it would probably be best done as a kind of comedy, in the style of Make a Wish or something similar to that. Taking everything a bit too far, but in a funny way. As opposed to making it a serious fic.