A character letter plays a dual role. Use specific examples of when you observed the defendant's good character.Describe a time you saw the defendant go out of his way to help someone in need. A character letter is designed to show support for a defendant in a criminal case. These letters have the potential to influence the court. Address the judge respectfully. Briefly introduce yourself and your relationship to the individual. These are commonly used during a sentencing hearing. No information is available for this page. A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things.