If you add this script to your Special:MyPage/common.js, it will mark all linked blocked users with a strikethrough, and mark all linked indefinitely blocked users with italics and a strikethrough.

Installation

Just copy and paste the line below

importScriptURI('//ru.wikipedia.org/w/index.php?title=MediaWiki:Gadget-markblocked.js&action=raw&ctype=text/javascript');