I wont comment on the validness of the OP's post but some changes for sure need to be made. Blacklist should remove you from friends list and make you unsearchable to said person. Your old character name should not lead people to your new character on the lodestone. Still its best to use the tools that are at hand blacklist the offending players characters main/alts, take advantage of player housing if you got and apartment,fc room or personal house. Then lock the doors and go inside if someone is constantly following you especially if you are just standing around talking or afk. Last ditch option that I would not recommend doing giving them a dose of their own medicine.