Thread:Mathmagician/@comment-4795804-20130404205745/@comment-4674838-20130405024903

Yes, it is possible to have custom user groups. But, like extensions, user groups are managed server-side by Wikia staff and you don't have access to them from the user level.

To create a custom user group or modify the rights of an existing group, you would need to first have a community discussion. Once it seems like most of the people on your wiki agree with the decision, send an email to Wikia at Special:Contact with a description of the user group change request and a link to the community discussion.