Writing a character letter for a judge can be a daunting task. Here are nine essential tips for writing an effective sentencing 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. 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. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template. There's not time to read all that comes before a judge to read. 2. The docket number begins with a letter which tells the type of case filed.