Remember the Titans (2000)
Sunshine played by Kip Pardue
An ego (to a degree) is also needed to succeed at the position as the quarterback needs to believe that every play he or she personally calls or ball thrown will be successful.
Other needs to be a good quarterback: Team player Cool Headed A Competitive Fire to win every game Clutch Physically Tough can withstand hits without too much compliant Field Vision to make correct reads Arm Strength to some degree but not most important trait Throwing Accuracy
Which quarterback would you want making the plays for you under center?