Praying for someone to become a better person is a kind and loving thing to do. Here is a prayer you can use:
Dear Lord, I lift up [person’s name] to you today. I ask that you would work in their life to help them become the person you created them to be. I pray that they would grow in their relationship with you and seek your will for their life.
I ask that you would give them wisdom and discernment to make good choices. Help them to turn away from anything that is not pleasing to you and to follow your ways. May they be a person of integrity and honor, and may they bring joy and blessing to those around them.
I pray that they would experience your love and grace in a deeper way and that they would be transformed by it.
In your precious name I pray, Amen.
Remember to also pray for yourself, asking for God’s help in becoming the person he has created you to be.