Hey there. As it stands, I think creating the new fanon wiki was a good choice. As the founder of the original Fanon Wiki and an admin there, they are entitled to block who they want really - that is the right of all admins.
They have told me they regretted making some of those changes to the wiki and have indeed reverted some of them.
Right now, I think it's best to move on and focus your efforts on the new wiki and we can go from there. :)
Good idea. Don't forget you can contact me about things like global blocking that user, given I'm assigned to 101DS Wiki (so loosely the Fanon Wiki). We'll see how the situation develops but I wouldn't worry or focus too much attention on it. Lots of exciting things happening on your other wikis! :)