Echo
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Echo (エコー, Ekō) is Adrian's childhood friend. Echo deeply admires Adrian for putting his younger brother's needs ahead of himself despite the fact that he will always be considered lesser than the true heir to the Gecko family name. She sees that he is fit to rule the world as a king, though his responsibilities to his sibling prevent him from doing so. In the dub, she states that Adrian must remain in the alternate dimension to remind him of his goal. As an adult, she is the captain of the Gecko Financial Group's spy submarine. Echo also carries a locket around her neck with a picture of Adrian enclosed in it.
When Jaden and his companions open the portal to the third alternate dimension in search of Jesse, she and Crowler get sucked in. She later meets up Aster and Zane only for Adrian, now hellbent on fulfilling his dream, to show up as well. During Adrian and Aster's duel, Echo is sacrificed by Adrian to the spirit of Exodia the Forbidden One to make it his servant. Despite this, her spirit still loved him. Her spirit later aids Adrian in his duel against when Jesse he's possessed by Yubel, but only ends being used by Yubel to regain its power when the psychopath feeds off the darkness in her soul. She completely disappears after Adrian's defeat, causing him to mourn for her loss. It is assumed that she, along with all those who died in the alternate dimension, returned back. Along with Adrian, her whereabouts are unknown.
In the English dubs, Echo is voiced by Priscilla Everett, while Yuki Nakao takes the role in the Japanese version.
Her name is derived from the name of the nymph Echo in Greek mythology.
It is unknown if Echo ever had a deck or not but she has been seen using the "Short Circuit" cards on multiple occasions.
