An immigration character reference letter should include four parts: introduction of the writer, the writer's relationship with the subject, statements and examples about character traits and a personal compliment from the writer about the subject. The writer should neatly write or type the letter and have it notarized to confirm the writer's signature.
If the writer is a current or past employer, then it is appropriate for the writer to include information about the work the subject did. He or she should include details such as job title, performance and time worked. The writer should also include positive statements about the subject's skills and abilities and how those skills helped improve the company.