Common traits of a great developer you have worked with?

Of the developers you have worked with, what were the traits you felt due to which he/she was a great and an inspiring developer. If not common what qualities the developer had due to which he is doing pretty good in the career now.

Lets try to answer only uplifting qualities and not politics etc. I doubt if politics at work can be learned?

(This post is also for engineers who wants to grow and might get some direction if there is a pattern in the common traits. So please help the community to inspire :))