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. You have accepted the plea. The letter should include the name of the court your case was filed in and the case number at the top right. Put the caption (St. v. I once received a letter from a defendant who was already in prison serving his sentence. What you would expect to see from (Defendant Name) in the future regarding his work, community service and the like. 6. Fill out all of the attached forms correctly.