Hi Donna,
“Just exploring here…Although, without “me’ness”, who or what are we without characteristics or cravings (i.e., lifestream)? Or put another way, what’s left of the lifestream after removing characteristics/habits, cravings? Or is it just mind that’s left? Or are there gati left just no attachments?”
Even for the arahants, there will still be some personality traits in them. This is evident in the suttas. Believe the arahant’s lifestream is sustained by their kammic energy or their Ayusankhara. 3 months before the Buddha’s Parinibbana, He declared to his disciples that He would give up Ayusankhara and enter Parinibbana. Maybe this Ayusankhara is the will to live?