Reference: Optional Parameters
Many commands make use of optional parameters. These are parameters that don’t appear in the main command palette and are only accessed by hitting tab or clicking the +N more text.
Optional parameters hidden (default):

After tabbing or clicking “more”:

Optional parameters are simply that: optional. If you don’t supply them, the default value will be used, which varies on an option-by-option basis.
The character
option
Many commands have an optional character
parameter. It is still optional, even if you have more than one character! If more than one character can execute a command, Botch and Beat will present a menu from which you can select the character to use. Simply click one, and you’re off to the races.

Some users (including the person typing this very sentence) don’t like to click around on that menu, however, and it is for those people that the character
option exists.
(For some commands, such as /character delete
, character
is required. In those cases, there’s no avoiding its use.)