Click on the nickname to enter the rename window. If the input method can directly input the icon you want to match, you can insert it directly after the name;
If you can't input directly, open the chat window with friends, click on the smiling face in the input box and enter the expression window.
Find the symbol icon you want in the expression window and send it to your friends, then press and select Copy, then go back to the nickname you just modified and paste it after the WeChat nickname.
If there is no desired matching icon in the expression, you can download one from the Internet or make one yourself and save it in your mobile phone, then click the+sign in the expression window to add it to the custom expression, then send it to your friends, and then copy and paste it into your nickname.