I agree with all previous posts. I would add:
1) A high level of honest and sincere communication skills (we deal with so many different people, in so many different environments, with little to no preparation. It really is good to know how to adapt your message and/or overall communication style on the fly, and still be able to develop fabulous rapport and connection).
2) Personal and professional integrity, respect, and ethics (kind of all the same thing, but still…). You have to present yourself in every situation in such a way that if somebody was watching you (and you didn’t know) you wouldn’t be embarrassed or immediately change the way you behaved.