How can I getName() the player when he/she offline. Because I use it when the player offline didn't work
I would suggest you to make a (.yml) file and add it into the file. You can check it when the player is online.. I'm not sure about the OfflinePlayer get thing..... It would be easier using a config and check it on PlayerJoinEvent or PreLoginEvent*
If the person has to write the full name, then the player's name is $args[0] But I'm quite sure it's possible to check if a player file exists of that player...