|Anime debut||Yu-Gi-Oh! VRAINS episode 55: "To the Unknown World"|
Echo (エコー, Ekō) is a program in the Yu-Gi-Oh! VRAINS anime, created by Windy.
During its first appearance, Echo's only dialogue was to repeat the last thing that Windy has said, hence his name, though this was dropped in its later appearances. Windy uses Echo's "hand" as a pedestal, standing on it as other Ignis have been shown to stand in the Duel Disks of their partners.
Windy created Echo and modified his code to create an illusory monster that looked the same as the one that destroyed Cyberse. He used the illusion to scare Ai and Flame when they came to the Wind world with their partners, Playmaker and Soulburner. After doing so, Windy told Echo to resume his normal form. He did, and Windy proceeds to show his guests around while sitting on Echo's hand. Echo simply repeated everything that Windy said afterwards.
Echo continued in this same role when Ai was lured into a meeting with Windy and Lightning. Windy had created multiple copies of Echo and utilized the others as guards for his fake Cyberse World. These guards would be Dueled and defeated by the Knights of Hanoi.