Thread:Bdj610/@comment-35644453-20180521190232/@comment-32763141-20180521213531

This is from this wiki's .css:
 * .Wall .edited-by a.subtle[href$="Wall:Angry_Hearts"]:after,
 * .Wall .edited-by a.subtle[href$="Wall:Bdj610"]:after {
 * color: #00cc44 !important;
 * content: "bureaucrat" !important;
 * font-family: Nunito;
 * font-size: 18px;
 * font-variant: small-caps;
 * font-weight: 400;
 * }

Try copying and pasting it into your wiki's .css and changing the usernames, fonts, and color codes. You can access MediaWiki:Wikia.css on your wiki in the admin dashboard.