Anxiety and online harasser

Hey guys, this is my first post and this is something I been needing advice about for a long time. One of my coping mechanisms has been creating characters and role playing, and while it calms me to draw and play my characters It also causes me so much anxiety at times because of this one person. From the moment I joined shes been very rude to me and claims I steal her characters, while I know I dont, my newest character does have similarities to them, but also a very popular character in the game.

Shes sent me death threats, have made plans to try and make me look bad and messages people about me. Recently I found out that she has antisocial personality disorder and that a lot of other people went through the same thing so it confirms it not personal, but because Im so anxious I somehow convince myself they really are too similar. While I deal with her way better than I did last year, and I dont want to leave a community that makes me happy (besides for one over bearing person) I really need advice on how to deal with being targeted by someone like this. The harassment has been coming in waves for about 2 years and blocking her or reporting doesnt work.