Friend endlessly stalked and harassed by another player on many characters

[ZephyrMenodora]

Blacklist and report. Even if they delete characters they GMs would know what account they are using.

No one here can do anything for you other than tell you to use official channels.

Also stop asking them to stop. Just blacklist, report, and don't bother engaging. They'll grow bored eventually or have their accounts banned.

[Donze]

It seems like people like to complain about being the center of negative attention more than just blacklisting and reporting.

The game features improvements on blacklisting to address the immediate, and reporting them addresses the longer term.
Do not "try to keep them on your friends list so you can avoid them" or similar. Blacklist and report.

Its ignorant to assume we know whether 'they will grow bored', but if they attempt to persist in some of the loopholes, SE imposes a Temporary Service Account Suspension, which includes " It is prohibited to do this anywhere an expression can be made, such as chat (including Quick Chat in PvP content, macros, and emotes), markers, comments, or titles".

SE FAQ: https://support.na.square-enix.com/f...%20or%20titles.

[LibitIncarne]

Blacklist and report. Even if they delete characters they GMs would know what account they are using.
Also stop asking them to stop. Just blacklist, report, and don't bother engaging. They'll grow bored eventually or have their accounts banned.

Seriously, at this point ONE BLACKLISTING is enough unless the "stalker" has multiple service accounts that they're using to do this.