Patience: Nothing worthwhile ever comes easy. Not one natural bodybuilder who looks awesome took anything less than many YEARS to get where they are.
Dedication: Just look at the logs of Rich Knapp, Emeka and others to see what this looks like in the gym and outside of it. Those guys don't believe in shortcuts.
Determination: Getting past setbacks and getting it done.
I'm no bodybuilder but that's some of what being a BB means to me.
And what the lads said above