(fallen london stamps by one time, years ago, The Girl decided that guilt and shame were holding her back, and decided that the solution was to create a persona that couldn't feel these things and overwrite her personality with it using brain witchcraft
it stuck for like, a week tops? and then she went back to normal. except that the peeled-off persona came to life and became a headmate.
this is where I'd make some kind of sarcastic comment about how she shouldn't have expected anything else, except that years later, we decided to cope with the stress of the job hunt by roleplaying a Competent No-Nonsense Tech Mage while job hunting. and BIG SURPRISE, the same exact thing happened