For all the mess he causes on a daily basis, culminating in the huge mess he did today. He's probably going to contact you on some other wiki to beg you to unblock him, so, feel free to extend his block if he does so.
Sit down, this is going to be a long reply, as a lot of things happened yesterday and I think you should be informed.
First thing, Griff wanted to rename the page Mermaid (She Creature) to "Queen of the Lair", claiming that was her real name. I don't remember that name being used, and although it's been some years since I've watched the film. I'm quite sure it's not an official designation in-universe. If it was used at all, it was probably an off-hand description or something. Griff, as usual, admits that he never watched the film and his only source is Wikipedia. As usual.
Next thing I know, he's created a duplicate page about the same creature, under the name "Queen of the Lair", which I deleted and made into a redirect instead. Not content, Griffguy tried to rename the mermaid page to "Queen of the Lair" and, in the process, accidentally renamed it to "Qu" and then changed the name in the description. AND he added another image to the gallery, which was an uncropped, but otherwise exact copy of this image, which was already in the page. Yes, he added a duplicate image to the page that already had that image. And to add insult to injury, he asked me to help him rename the page.
Then comes the worst part. I blocked Griffguy for three months for creating duplicate articles, duplicate images AND renaming pages after being told not to. I told him that if he went to other wikis to beg me to unblock him, I would double the length of his block. He still did it, three times, so I extended his block to an year. And then comes the ultimate proof (as if there could be any doubt) that Griffguy is not a well-intentioned user but rather a troll. Not only did he keep asking me to unblock him, claiming that he was lonely (and, I swear man, claiming that his talent for making pages was "unique"), but he also asked me if I could make him an admin.
The only good thing that came from all of this is that there's a reasonable chance that Griff is not coming back. I gave him the idea of making his own wiki where he could be the admin and mess around as much as he wants, and he seems to have enjoyed that thought. I still fear that he might come back under a different account, as persistent trolls and vandals often do. And I'm fairly certain that after a few weeks he will get bored of having his own wiki and will find some other community to torment. Hopefully, though, it might not be here.
No reason, his message was: "I just don't want my blocked to be longer besides I waited a whole year to be back on the Goosebumps wiki and I can't wait another year to be back on the non-aliens species wiki, so can you shortened it for three months and I promise that I won't message you on other wiki, but til then when I'm unblocked can you make me an Admin on the non-aliens wiki please bluefrackle?".