Board Thread:General Discussion/@comment-26408193-20160102143053/@comment--20160102143744

The community should start a public discussion on demoting the bureaucrat. If the majority agrees on the demotion you would then send it to Special:Contact/general.

You can see this blog for more information. At the bottom where it says "If you are unhappy with an admin and you feel they should lose their rights, you can propose this on the wikia itself. Then the community as a whole can decide whether the admin should stay or go.".