Friend endlessly stalked and harassed by another player on many characters

[Kohashi]

That aside, I've always wondered if somehow there's something I can improve on myself to lessen the risk of it.

Be very careful what kind of information you exchange and how much of it. Somehow it became very normalized to have 0 privacy and people have their entire lives visible at all times on media platforms or shout calling it.

Be nice and kind but also keep a safe distance, especially in the early phases.