Happy fools — We hear them say “go with flow” too many times and tend to change their plans way too often. For them nothing can be planned and we need to take each day as it comes. These people are happy but ignorant about the future and find bliss in that ignorance.
Problem solvers — These are people who go to extreme limits for the cause they believe in. In a micro level, remember your friend who always wanted to be a doctor since childhood and ended up becoming one? People like him, with their sheer ability to set goals and pursue them, have shaped their future.