If he's only following you in particular, you could try changing your name and using a phial to change your appearance. Also you might want to considering dropping your fc temporarily just in case he notices someone reappearing as your current character disappeared. That's pretty much the most you can do if the gms aren't getting involved. If he strickly following your fc in particular, there really isn't much you can do besides telling new members to put him on the blacklist and treat him as mobile lawn ornament.