Can you still log in to the wikia account? If you can, change the password.
If you can't log in to the wikia account, log out of your new account, click "Log In", type in your Matsumotorika username and click "Forgot your password?" (leave the password box blank), it will send a password reminder message to the email you made the Matsumotorika account with.
To change your wikia password, log in, hover your cursor over the upside-down triangle next to your username (located at the top right of your screen), click "My preferences" and you should see under "Basic information"; My password: change password.. click change password. You will need to put in your old password and put in a new password.
Change your email password. If the hacker changed your email address password..You can have your password reset by answering the security question(s) that you had filled in when you created the email..
Go to the hotmail website sign in page. Click the blue link that says "Can't access your account?"
It will bring you to a page called "Why are you having trouble signing in?" click "I think someone else is using my Microsoft account" then click "Next", type in your microsoft account (email address) and fill in the captcha then click "Next". Afterwards it will bring you to a page called "We need to verify your identity".. click "Use my security question".. answer the question (Hopefully you remember it) then it will let you reset your password.
I saw your edit. Thanks for telling me, I'll keep it in mind. I was just re-watching a part of the DVD Magazine earlier and while doing it I noted down some things that were mentioned there. But I noticed that Momo's trivia is pretty long :)