CausalXXLinkXx is a downloadable Ghost Duelist in Yu-Gi-Oh! 5D's World Championship 2009: Stardust Accelerator.
The characters used by the top 3 players of the 2009 DS World Championship tournament were made available as downloadable opponents in the game. CausalXXLinkXx was the avatar of Emily Fuchs, who placed third and also had a downloadable opponent based on her success in the previous game, Angel. Flower and Ayu were the avatars of the winner and runner up respectively in the tournament.
CausalXXLinkXx uses a DARK Synchro Deck, which was used by her creator in the World Championship tournament. It is titled "3rd Place Deck" within the video game, but at the World Championship Tournament it was called "KennySo.dek".