Guide to how to file for expungement in the California courts, includes line-by-line instructions on how to fill out forms and how to read a RAP sheet. The character reference letter for court serves the purpose of offering the Judge insights into the Defendant's moral or mental attributes.Sample Format for a Character Letter. If you have been asked to write a character letter, this simple template may be a useful guide. A character letter plays a dual role. To clear your record, you must file a Record Clearance Application.