Wii U:Haxchi

Haxchi is a custom firmware that can quickly apply IOSUHAX using a channel on the Wii U Menu. It overwrites an installed DS Virtual Console game, so you must purchase a game from the eShop and make it unusuable in the process. You could then load Haxchi automatically by using Coldboot Haxchi, known in short as CBHC.

Usage
The DS game that Haxchi is installed over will be replaced by the Haxchi Launcher. Launching this channel loads up the Haxchi CFW, although certain buttons can be configured to perform certain actions instead of loading the CFW (e.g. you configure A to load the Homebrew Launcher to skip the need to run the Browserhax exploit).

Uninstallation
Haxchi can be uninstalled by deleting the Haxchi Launcher in the native System Settings application. Once that is gone, the game used to launch Haxchi can be redownloaded normally from the eShop.

Coldboot Haxchi can be uninstalled according to the instructions on this page.