Board Thread:Support Requests - Community Management/@comment-25366361-20140901131611/@comment-452-20140901134044

Have you contacted them already?

If you "Assume Good Faith", you should always assume that users are confused, and don't know they're doing anything wrong, which would mean that the user may simply not understand the subject of the wiki.

Politely inform them that the subject of the wiki is the actual content of the show, and invite them to find a "peg + cat fan fiction wiki" (Or find one yourself and link him to it.)

Or, if the content is completely unrelated to the show, suggest that they create their own wiki for original content.

On the other hand, if they've never contributed anything of worth to the wiki, you can simply ask the admin of that wiki to block them.