|Unnamed Yliaster member|
Yu-Gi-Oh! 5D's Episode 28: "A Web of Deceit, Part 2"
This unnamed individual claims to be from the organization of Yliaster.
This mysterious person appears before Roman 17 years prior to the pilot at the famous Nazca Lines, claiming that Roman should be the one in control of the experiments on the Old Ener-D, even if it means getting rid of Dr. Fudo. He also seems to be quite knowledgeable of the 5,000 year old conflict between the Signers and Dark Signers, acknowledging Roman's Dragon Head Birthmark. After briefly conversing with Roman, he simply disappears into a sandstorm.
He also appeared later when Rex went to confront his brother, Roman, conversing with Lazar, confirming Rex's actions, and stating that the world has been waiting 20 years for them to make their decision.