Displays the description text , the "Who Will" prompt, waits for the player to select a character, and stores the selection. If the escape key is pressed instead, the select is canceled, and the event exits.
The result of the selection is stored internally in the VAR_C variable. This is used in other opcodes, such as TakeOrGive. If there are less than 6 characters, it will wait until a valid character is selected. If there is only one character in the party, it skips the prompt and just selects 1 automatically.
The same "Who Will" code is called by the Open Grate command, and the SetChar opcode, except the "description" is one of the Who Will options below instead of a map text.