How should you start a leniency letter? I am writing this letter on behalf of a family member mine who is presently before you on criminal charges and is due to be sentenced shortly.Your Honor, I am writing you concerning my sentencing hearing. I understand that I have made a decision that will impact my entire life. In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. A character letter is designed to show support for a defendant in a criminal case. These letters have the potential to influence the court.