Character is simply habit long enough continued.
Decide carefully about embracing new habits, breaking old ones and those you want to maintain. Make sure your habits express the values of the Christian you proclaim to be.
Do not be misled: “Bad company corrupts good character.” Come back to your senses as you ought, and stop sinning; for there are some who are ignorant of God—I say this to your shame.
1 Corinthians 15:33-34