I've encountered these kinds of people before, especially if they're known for committing these acts from one Fandom to the next. Let's say I'm all too familiar with these kinds of certain people that just cause trouble for kicks, and then move to the next, even if they're blocked. And it seems he's done the same thing on two other lesser Fandoms as well.
Not just this Wiki, but from the entire Fandom. Blocking him isn't just enough since he's likely to jump to another Fandom/Wiki to continue on his endeavours unless he's entirely dealt with. Only solution is through VSTF, since they can easily block people who commit cross-wiki vandalism.