I don't have enough memory to know. Perhaps my abusers did, it would seem likely because of how sadistic and calculated they were, from what I do remember. Also I can surmise it from one of my alters. Gnash got a lot of who he was from one of my abusers, specifically (he changed a whole lot over time and gained a conscience and a love for God, by the way, so the way I describe him here is how he was in the past). He was sadistic and and extremely manipulative. He could read people very well and seemed to know exactly what to say to them to get them to do what he wanted, and he was patient with this. Sometimes he would spend months or years working on someone to mold them to fulfill a certain role or even to just agree with him. One of my former lovers had what seemed to be a few parts. Now, I have no idea if they were as discrete as DID or if these were ego states, this was over a decade ago. But Gnash would coax one of them out and call him by his nickname. He liked this one because he could manipulate him and be his, er... worst. That's to say he called out this side of my partner because it worked to his personal advantage and delight. These things remind me of one of my abusers very strongly but I have no specific memories I can access about it (nor do I want to), just a sense.