From OpenKore Wiki
- char <number>
- This option specifies the character to login as from the character select server. This number is the index of your character as displayed in the character selection screen. Your first character is index 0, second is 1, and so on.
Note: You don't have to set this option. If you leave it empty, OpenKore will ask you for you to choose when needed, providing short tip and/or list of possible values.