If its only showing your JP char it should be fine because that was a char you created on your beta p4 account correct? And does It show that account to merge too? You shouldn't be worried that its showing a diff char because the game has no way of knowing which is your main hence showing the last character you created. I think as long as it shows a character from that p4 account you created it will be fine. But waiting may be a wiser choice just to be sure.