Kelly Layzner ケリィ・レズナー

Kelly Layzner is a former Zeon lieutenant who fought alongside Gato during the One-Year war, ultimately losing his left arm. When Kou is beaten up by hoodlums in Von Braun City, Kelly helps him recover his mental faculties and the two become friends. However, the two of them are well aware that if they meet in battle, they will have no choice but to fight each other. Source: Wikipedia