I was occasionally the target of bullying when I was younger; but I developed the facade of the "crazy kid" so I was left untouched. The act of bullying probably extends from some insecurity within the bully. "Tread on the weak so you remain strong" kind of thing. I would always forecast the bully as someone who wouldn't progress in the real world as long as he continued his childish ways. Of course, I was wrong.
I would say that EXXJs would be the most likely to bully, but any type can victimize or be the victim.