Character reference letters can play an important role in defending a criminal case. While "character" is normally not at issue in a jury trial.Sample Format for a Character Letter. If you have been asked to write a character letter, this simple template may be a useful guide. Learn to write an impactful character reference letter. Follow our guide for key content, proper addressing, and acceptable formats. In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter. Good character reference letters help the judge understand the defendant as an individual. Ideally, the writer should express how he or she knows the defendant. If you've been asked to write to the judge, use our sample character reference letter and fill-in-the-blank template.