Thread:"I Want a Stand" by me/@comment-22439-20150809070025/@comment-1739368-20150809093120

You can though you have to send a request to the wikia staff and can only change it once: http://community.wikia.com/wiki/Special:Contact/rename-account

From what I've seen they usually change it within a day, though the wiki does have a stay logged in function, so it's not like you'd have to log in everytime.