Another good character trait that I think holds the most value is trust. Being able to trust someone in a time of need is one of the most important values and characteristics in life. Having trust in both yourself and others turns out to be one of the biggest life lessons you can learn. Being able to trust others and yourself will help build up a good character.
You need to trust the people closest to you. If someone is a bad influence in your life, then you know you can't trust and depend on them for moral support. Breaking someone's trust is also very devastating to experience.
For example: Let's just say a friend starts to drink and do drugs. I would be unable to trust that someone anymore, even if I didn't want to.