Board Thread:Support Requests - Designing Your Wiki/@comment-30275132-20161120101123/@comment-5811199-20161120101735

Yes, you can! You can take a look and try ProfileTags.

If it's just the admin tag you want to change, and not have special customised tags for everyone, you can modify the page MediaWiki:User-identity-box-group-sysop on your wiki.