I know this is a really vague question, but what are some possible ways having BPD could effect someone with DID or OSDD?
i think it would turn identity confusion up to 100. people with BPD tend to experience identity disturbances as one or more of these four factors:
role absorption ("defin[ing] themselves in terms of a single role or cause"),
painful incoherence (distress over identity confusion),
inconsistency (an "objective incoherence in thought, feeling, and behavior")
and lack of commitment
(from Wilkinson-Ryan & Western, 'Identity Disturbance in BPD: An Empirical Investigation', American Journal of Psychiatry (2000))
if someone had BPD with comorbid DID/OSDD, we can see how these factors would be amplified and probably split among parts.
mood swings would probably also be split among parts (e.g., one part holds anger, another joy, etc.). there might be parts who specifically deal with the intense anger people with BPD can experience.
fear of abandonment probably plays into trauma (neglect, emotional and physical especially). i can imagine young parts would experience this symptom especially strongly.
parts may come into conflict over impulsivity, especially as BPD impulsivity is damaging.
emptiness may accompany dissociation, especially depersonalisation.
and of course BPD dissociation will be a much more prominent symptom with a comorbid dissociative disorder!
you may find this post on BPD & DID comorbidity by this-is-not-dissociative useful.
