The way I see it character as it pertains to individuals is much like characters in fiction. There are static characters and there are dynamic characters. Static characters are don’t change, they are constant. When presented with a situation, task, or problem, they respond predictably throughout the story. Dynamic characters undergo development. They have experiences that change their behavior or motivation, often for the better.
Unlike in fiction, in reality we can choose whether we want to be a static character or a dynamic character. Our character development comes from our choices and our attitudes. We can choose to learn and gain something from our experiences, or we can choose to not to.