The best FOs will have the Captain look good by the end of the day, regardless of his/her abilities, attitude or aptitude.
They will in turn make the best commanders, since they have ample experience, tact, manners and leadership.
Good leaders lead by example, they praise in public, reprimand in private and stay in the background until the s**t hits the fan.
Any aviator will benefit from reading the book "Fate is the hunter", by Ernest K. Gann.
A little humility goes a long way, remember a lot was accomplished before our time in aviation.
Happy holidays to all, and fly safe!