pleasant and hard working.
That will take you far in the world. Good help is hard to find. Bosses (and co-workers) are looking for those who can walk away from drama and just "Get 'er done." I try to strike a balance between seriousness and good humor on the job. I aim to be productive, but have fun doing it.
Think about who you like to work with and work for. Visualize yourself being productive and happy on the job, and you'll have a picture of a valued co-worker.
Be the change!