I've been thinking about what I'd want from a sub and/or masochist, or whether I'd just want a slave. 

The vast majority of you are aware, they're not the same thing. 

I think I lean more towards a masochist or slave at this point, and then I think about what I would look for in a potential. 

I think the main thing is one that I couldn't damage mentally or emotionally any further, no matter how far we go following negotiations. 

I don't think there's such a thing as a true "no limits" s type, everyone has limits, even if that limit is death/not wanting to die, it's still a limit, so one with very few limits would be desired.

I think I'd prefer someone who already has their own trauma, as odd as that may sound, I think I'd feel less guilty adding to existing issues rather than giving someone their first trauma. 

Still, this is all pie in the sky as while I know these people exist, they never seem to exist near me...

Ah well such is life