"Learn how to craft an effective character reference letter for court proceedings with our comprehensive guide. Free template for a character reference letter for a DUI charge!In this article, we will discuss how to write a formal letter to a judge, along with the proper format and a sample letter. The structure of the letter; What to include in the letter and what to omit; A sample character reference letter; Specific tips for writing it. Sample Format for a Character Letter. If you have been asked to write a character letter, this simple template may be a useful guide. Tips: Keep the letter honest but positive. Avoid downplaying the seriousness of the DUI. How you know (Defendant Name). For example, are you a co-worker, a neighbor, a relative. 2.