... 

With the multiplicity of societies in the Traveller milieu, it's not
unreasonable to accept that there may be societies that accept what we call
"Multiple Personality Disorder" or "Dissociative Identity Disorder" as a
normal condition, rather than a disorder*.

How could this be handled in Traveller? How would you create a 'multiple'
character? What do you perceive as issues that would have to be addressed,
and how would you address them?