I prefer the placement of the Visually Similar Kanji section in tomboy’s script to WaniKani’s placement since it makes it quite hard to actually compare a Kanji to its similar Kanji. This simple script moves the Visually Similar Kanji section up to where tomboy’s script originally placed it. HTH.
// ==UserScript==
// @name Visually Similar Kanji
// @namespace http://tampermonkey.net/
// @version 0.1
// @author You
// @match https://www.wanikani.com/kanji/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
$('section')[1].before($('section')[8]);
})();