Echo
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. 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 posessed by the demon arm, 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.
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.
