[Xysash]

I normally hate personality rewrites, but that's because they usually don't leave anything of the original person behind.

Something where there's genuine continuity of personality, where they recognize the changes as they're happening? That's awesome.

I also support what duckboy43 said about changes to the character's speech patterns. That sort of thing is really fun.

Incidentally, this thread has given me an idea for a story. A guy decides that the girl next door, who he's always had a crush on, has become too outgoing and wild, so he decides to use a mind control device to make her shy and withdrawn. It works at first, but then her old traits start reasserting themselves. It turns out that somebody else is trying to control her as well!