Court Persona is either your PC's ID or that of one of your NPCs, whose physical abilities you use in the Interactive Court. This is useful because brawls and duels are possible in the Interactive Court and the stronger your Court Persona is, in terms of Protection, Endurance and Attack values, the better off you are. You can change the character you use for a court persona on the Household affairs menu. The menu option allows you to add yourself or any NPC as your Court Persona, or remove the character currently used. When there is no NPC used as a Court Persona, then your own character is used by default.