That still runs into the potential issue of people omitting information and stuff like that which I might want to know about a fanfiction, and if it's a more obscure one it would be difficult to track down.

... Though to be honest, I... find a lot of the themes involved with the character really disturbing which is why one of my objections was to the character fitting into the RP.

Mind control and things related to it I won't allow, and that's one of the reasons for it. While this lacks some of the problems of mind control, it's... still very disturbing in a similar way.