If you want to give Liu Yi a personal signature, you can consider the following options: 1. Write down his name: Liu Yi. 2. Use his appearance or personality traits: Liu Yi is a tall and strong man. 3 Use his profession or achievement: Liu Yi is a brave warrior who has made great contributions to protecting the country. To use his famous quote, Liu Yi once said,"Courage is not a fearless mind, but a mind that is prepared for the challenges it faces." 5. Use his hobbies: Liu Yi likes reading, writing, and working out. Of course, the details of how to write a personal signature would depend on your inspiration and preferences.