Quotes that represent key characters.
"Is it better to be born good and righteous or to overcome our evil nature with great difficulty?"
"A little power corrupts a weak ego, medium power corrupts an undisciplined body, a lot of power corrupts a curious mind, but even absolute power will never corrupt a pure soul."
"I do not look at the future for comfort. I look at the future because I refuse to relive my past."
"I have power. It is mine to control, and because of that power, I am finally free."
"I choose to stay awake in the darkness so that those that I love may sleep peacefully in its presence.''
A good way for me to get a character concept is to write a quote that represents them.
Try it out and see if it is true for you.