I'm tracking down where a particular user has been recently and it looks like at three of his accounts have been here since February:
Bugs Bunny Gets The Boid
Paramount, A Viacom Company
These are all sockpuppets of Caidin Johnson, who has a history of false information and vandalism stretching back to 2011 on both Wikipedia and Wikia/Fandom. He has "block on sight" status on several wikis, including the ones I am an admin for, and Wikipedia has dedicated sockpuppet investigation pages for him. Sometime this year, he'll make his 200th sockpuppet account, but many of them are obvious, such as including variations of his name, or things like "Eye TV" (whatever that is supposed to be), Crayola crayons, company names, and things inflating/deflating and blowing up/popping.
I recommend that you put a permanent block on the "Paramount, A Viacom Company" account. He does go back and check to see if an old account can be used again when blocks expire and continues his vandalism with them.