Did you do training to have your parts communicate with each other? I tried imaginative meditation with the goal of for example bringing my collective to sit around a cosy campfire, become friends and ask for each other’s advice. But in my case I always had a strong sense of a single me and only recently discovered that due to stress or an overwhelming feeling of happiness one part of that whole becomes very dominant. In that regard, what you describe as an entity taking over sounds very familiar to me.

I want to get better at integrating my personas and am wondering if meditation is the only way forward. Any tips?