Just read Patrick Lencione's The Ideal Team Player. I love Lencione's work -- it's always easy to read, thoughtful & elegant & wildly usable ideas wrapped in simple, down-to-earth language. 

His ideal team player is Humble, Hungry and Smart:

Humble: Not driven by ego or status; celebrate the contributions of others; emphasize team over self, collective over individual.

Hungry: Always looking for more. More to learn, more to experience, more to do, more to grow.

Smart: This isn't about intellectual prowess, but social smarts. A good sense about people, group dynamics, how to be and work and engage with other folks.

These are such great qualities for success and connection, in life and work.

AND I'd add a fourth: Healthy. We need to be healthy in body, mind, emotions and spirit. Able to stay physically healthy (clean air, water, environments, food; real rest; ways to prevent or recover from disease). Ways to get or stay emotionally regulated. Regular ability and space to get into deep work and flow. Encouragement to keep work connected to meaning.

Humble, Hungry and Smart demand personal commitment and discipline and then we bring those qualities to our life and work.

Certainly Healthy demands some degree of personal responsibility, yet it also requires collective and cultural commitment. Our collective entities (societies, governments, communities, school and workplaces) shape our health in huge ways. 

 Ideal leaders, managers and team players are all four: Healthy, Humble, Hungry and Smart. Each a combination of individual and collective commitments.