The behaviour of this person is really problematic since few months. He/she made personnal attacks against me in Bubble Witch 2 Saga Wiki because I banned this IP in Farm Heroes Super Saga Wiki for the reiterated irrelevant and abusive personnal attacks comments (using profane words or insulting king.com or admins). This person is active in Diamond Digger Saga Wiki, Bubble Witch 2 Saga Wiki and Farm Heroes Super Saga Wiki.
In Diamond Digger Saga I have not seen severe attacks by that person, just inappropriate words ("cheating", "bad design" and similar). For the moment I do not see a reason for an action, but I will of course continue to keep an eye on all changes and comments.
For the other wikis that you mentioned: I am not active in those, so I cannot judge.