Board Thread:Support Requests - Designing Your Wiki/@comment-28834934-20161105060333/@comment-27345308-20161105061318

You can make a name colored with CSS:

In that particular wiki, they used:

You can insert that CSS (with changing the name, color and background image and stuff) in your wiki's MediaWiki:Wikia.css or if your wiki was made after 2014 the better choice would be MediaWiki:Common.css, however don't forget to give credits to the source you copied it from.