Despite what we all learned growing up, when it comes to sharing, Troll's personalities are classed as an exception (along with chickenpox, answers to tests and telling the neighbors the truth about Uncle Jim)
They are best appreciated from afar. A degree in abnormal psychology or extensive readings and appreciation for absurdist literature is highly recommended.
The rule is one SSN per body, not per personality.
Which fact will probably precipitate another ....incident.
You remain the only person I know who can have co-dependency issues that don't involve another person.