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. "Learn how to craft an effective character reference letter for court proceedings with our comprehensive guide. A character letter plays a dual role. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template. Note to Petitioner: Please provide three (3) character references.