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Rather than having this rattle around in my brain further, I'll just ask.  Did you ever feel like your BPD had multiple personalities?  I don't mean the typical duality.  I'm not asking to be flip or to engage in pop psychology.  I experienced more than the black and white splitting with mine.  There were different communication channels, diction, responses, and demeanors with my ex.  There were major memory lapses and memory sets that were sometimes accessible in altered states and inaccessible in other times.  I'm just wondering if it is more common than I am thinking it is.

I'm not trying to diagnose my ex.  He had professionals to help him with that. I'm just reflecting on my experience and beyond the frequent psychotic episodes, there were memory lapses and dissociation / identity issues that went well beyond the norm with BPD, according to our experienced T.  I'm just wondering what the general experience was.

If anything I am more inclined to have multiple personalities more so than the ex. Well maybe, I can see the validity of everyone's perspective which creates what if I were in their shoes scenario.

My exBPD really had no personality. She was quite pliable and would take the traits of those she was around.
Almost like she was an empty canvas; the image being whatever the painter (the other person) would create.

Yes!
 
My uBPDexgf had about 4 different personalities she cycled through, but no real "core" self, if that makes sense. He default when things were good was "baby talk", which even included thumb sucking, saying things like "babes, i'm so sweepy (sleepy)". 
Then there was her out of the house "manic" personality when out for dinner or in public. This one bothered me the most. She was very loud, almost fighting back laughing the entire time, calling servers/waitresses honey or sweety. 
Anger/rage. Could default to this one from any of the others in the blink of an eye. Just enraged over the smallest stuff, temper tantrums, screaming, yelling, good times... . 
Finally there was despair. Unconsolable, crying, depressed, threatening suicide and "no one would even care if i killed myself". 
 
On very very rare occasions, she was almost lucid and normal. I remember going out for dinner with her one night in February, and she was so grounded, mind you, i was resisting the relationship, and she wanted it. I remember asking why she couldnt be like this all the time. She promised she would. Never saw that version of her again. Discarded me around Mothers day, instantly in a relationship with her new "soulmate", NC for 2 months now. But definitely a trend i noticed. 4 distinct personalities, but no real core personality.

I was discarded in October. Just after we became very close, like a switch, his feelings for me were dead, nothing inside him-blank stare. He couldnt stand being anywhere near me, poof! guy I loved disappeared, went on for months.I had to go to work with him everyday,and noticed in December he had a personality of a nine year old girl. He said he had to pee, and giggled. He talked to me for bout a half n hour in this child-like state.it wasn't a joke or anything, this made me very sad, as he is not on any medication, at this time i believed he had multiples, no doubt. I would see glimmers of the person I thought was him, the one I fell in love with, and thought he was coming back. I do believe that one is in there too.When I see that one, I feel sad, and miss him very much... but the true person wasn't there often. There was also another persona, a very wild almost animalistic, raw personality. He went in to the woods and attacked a group of coyote when he had this one on. He must have been running barefoot as he injured his foot pretty bad, but that was it. I got along well with this one, as he felt calmer around me, and drawn to me, completely uninhibited.Only saw this twice. I tagged another one"rock star" he would come into work with a very different stance, and long hair flying.He was very appealing to me when this side or persona was out. I'm not sure if this is the one that had the escapade in the woods... .and after all this there was so much confusion. My favorite was the kind, loving,respectful funny and humble guy I loved. I'm still trying to get over him not being in my life , but maybe it was just mirroring. Because I cant label it, I'm having a hard time with ruminations, processing, healing. Even though I say to myself, with this kind of mental illness there can be no relationship.