Forum:Suspicion of multible accounts

I've noticed and observed a user in Transformers Wiki, who seems to have been changed accounts for times. Every time I leave a user notice template or message on his talk page, he just quits and creates a new account to continue editing, completing ignoring the notice I gave before and editing with the wrong style. Besides the site policies (which does not allow multiple user accounts except for bots), though this user is not annoying yet, it just bugging me. Is there anyway (for Wikia Staff) to confirm if he is using multiple accounts via checking IP address or e-mail address like an admin in an ordinary forum site? -- TX55   TALK  03:34, April 27, 2010 (UTC)


 * The underlying IP has about 15 accounts created... -- 03:44, April 27, 2010 (UTC)


 * How can I find that? (It seems not be contain in the user creation log.) Thanks. :D -- TX55   TALK  11:31, April 27, 2010 (UTC)


 * I was going to email it to you, but it appears you have opted-out of email from other users... -- 11:58, April 27, 2010 (UTC)


 * Oh, I just changed my preference and enable the function. If it is okay, I'd like to receive and see the list, thank you! :D -- TX55   TALK  08:37, April 28, 2010 (UTC)


 * The extension used to see what IP's have created which accounts is Help:CheckUser, generally only available on Wikia to staff, VSTF. The 888th Avatar   (talk)  22:45, April 27, 2010 (UTC)


 * I see. The user so far is okay (no vandal, just... change his user name). And thanks for the information, I'll read the article right now. -- TX55   TALK  08:37, April 28, 2010 (UTC)