Discovered public repositories for Destroy666x in the GitHub catalog.
Plugin for MyBB forum software, coded for versions 1.8.x (will probably also work in 1.6.x/1.4.x). It displays the selected thread icon in showthread.php and two other related pages - printthread.php and newreply.php.
MyBB is a free and open source forum software.
MyBB IP to Flags plugin. It uses the registration/last visit/additional IP to get the flag using one of 3 methods (Maxmind database, PECL extension, geoplugin.net).
A plugin for MyBB forums that displays custom boxes on various forum pages.