Choosing just one is hard and it really depends on what role they fill. But a critical trait for anyone I work with: high ethical standards.
Naval articulates why this is so important in this 3 minute podcast.
I would counterintuitively say : Lazy.
As the good old Bill Gates says, “I will always choose a lazy person to do a difficult job, because he will find an easy way to do it.”
Empathy is such a good one! Work ethic is a quality I value hugely in my teammates. Being surrounded by people working hard always encourages me to do more of my best work. Great question!