We've been so chatty on this subject, LJ is collapsing the conversations. :) I keep having to click on the EXPAND option at the end of all the posts to see what we've been talking about.

Kate could be very vicious and very personal. Ziva too. I think the biggest difference is the attitude of the two characters. Kate was trained to kill but Ziva was a trained killer. Ziva has more of an edge IMHO. It's an almost cruel edge, not a playful one. It's almost like Kate would be laughing WITH Tony but Ziva is laughing AT Tony.