Friend endlessly stalked and harassed by another player on many characters

[Picothea]

Bullies stop bullying when their victims don't react.

Not necessarily, but it's worth a shot. It's common advice to stop reacting to bullies, but unfortunately some of the deeply pathetic ones (likely ones who would repeatedly make new characters/accounts to harass 1 person all day) have no real point where they choose to stop until someone forces them to, and may use more drastic measures to get your attention. If the harasser has a dumb personal reason for committing the harassment, they may be especially dedicated.

[Collin_Sky]

Not necessarily, but it's worth a shot. It's common advice to stop reacting to bullies, but unfortunately some of the deeply pathetic ones (likely ones who would repeatedly make new characters/accounts to harass 1 person all day) have no real point where they choose to stop until someone forces them to, and may use more drastic measures to get your attention. If the harasser has a dumb personal reason for committing the harassment, they may be especially dedicated.

Eventually they will stop. Even someone so obsessed will stop once they no longer receive whatever pleasure they get from it.