Grace is help from God to make character changes. Allowing Jesus Christ to be lord of our life changes character defects. Co-operate with God and stop trying to tell Him that He doesn't know what He's doing. Going on the offensive and resisting the devil builds character. Anyone who deals with temptation with a compliant attitude is sunk.
Firm responses build strong godly character.
Developing intimacy with God builds our character. Catch those quiet moments when you can be still and listen to the quiet stillness. As you develop the ability to draw near to God through prayer, meditation and scripture memorization, you gradually undergo a fundamental shift in your values. Without a positive shift in your values, you will not have a permanent shift in your character. Removing the stain of sin from our hands builds character.