A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. A character letter is designed to show support for a defendant in a criminal case.These letters have the potential to influence the court. How To Start Your Letter. I am writing this letter on behalf of a former student of mine who is presently before you on criminal charges and is due to be sentenced shortly. If you're not finding the forms you need, contact us at (801) 238-7990 or Click here to contact the web navigator. What parents and witnesses need to know about character reference letters to the court for child custody. Includes a downloadable sample and template. Character reference letters can play an important role in defending a criminal case. While "character" is normally not at issue in a jury trial.