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 is designed to show support for a defendant in a criminal case.These letters have the potential to influence the court. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. We provide templates and tips on how to properly address a letter to a judge, ensuring your letter begins and ends with the appropriate formalities. Dear Judge Mattison. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template. 1. Begin with your personal information. Defend a friend or family member's moral character in court.