Board Thread:General Discussion/@comment-27640447-20170201112104/@comment-168424-20170202185212

Your best bet for information on these mini-badges on the user avatars is ask Wikia staff at Special:Contact/general. This is not part of any MediaWiki feature set, so you can't look at MediaWiki docs to get info. Since this is a Wikia feature, you have to ask them. I'm guessing they don't want it to be too easily customizable yet.

You could also put a suggestion in at Script Suggestions board on Dev wiki to see if someone can work up a JS hack to customize it.