showleagues.user.js

// ==UserScript==
// @name         Show user's league
// @namespace    http://screddit.com
// @version      1.7
// @description  Show a user's 1v1 league
// @author       Cereal
// @match        http://*.battle.net/forums/*/sc2/topic/*
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';

$('head').append('<link xmlns="http://www.w3.org/1999/xhtml" rel="stylesheet" type="text/css" media="all" href="http://us.battle.net/sc2/static/css/sc2.css?v=46" />');
var $posts = $('.Topic-content > .TopicPost');
$posts.each(function(i, el) {
    var profileLink = $(el).find('.Author-name--profileLink');
    $.get(profileLink[0].href).done(function(res) {
        var badge = $(res).find('.module-body > .badge-item > .badge')[0];
        $(el).find('.TopicPost-author .Author-details').append(badge);
    });
});