Which famous person is an example of someone with a “good personality”? Who has a “bad personality”?

Personality can and has been defined in a myriad of ways. In preparation for delving into the topic of personality assessment address the following questions:

Why measure personality?
How do you define personality?
Which famous person is an example of someone with a “good personality”?
Who has a “bad personality”?
What are five personality traits that are affected by culture?