Sample Format for a Character Letter. If you have been asked to write a character letter, this simple template may be a useful guide.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. 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. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template. How to fill out the Character Reference Letter Template for Candidates? What parents and witnesses need to know about character reference letters to the court for child custody.