Dimensional counterparts

A dimensional counterpart is a phenomenon featured in the Yu-Gi-Oh! ARC-V anime, in which a person from one dimension resembles another person from another dimension. In addition to sharing the same face, the counterparts seem to be drawn to each other for an unknown reason.

History
Accordingly to Leo Akaba's actions, it is hinted that these counterparts are important to his plans. He is interested in Selena's unknown abilities and also expresses interest in getting a hold of Zuzu Boyle, stating that she is the "fourth piece" he needs, having already had Yuri capture Lulu and Rin for him.

Mistaken Identities
A common recurrence is for a character to confuse one counterpart with another counterpart due to their identical facial structures. Instances of confusion include:

Yuya Sakaki
Yuya was the first character to have a dimensional counterpart. Each of these counterparts has a Dimensional Dragon and also can enter a rampant state of mind as well as sync with each other. Each of his counterparts serves as the secondary protagonists of the series except for Yuri, who currently serves as major antagonist.

Zuzu Boyle
The second character to be known to have dimensional counterparts was Zuzu. Similar to Yuya and his counterparts having Dimensional Dragons to help signify themselves as counterparts, Zuzu and her counterparts wear unique jeweled bracelets, which have mysterious abilities. For this reason, they are collectively called Bracelet Girls (ブレスレットの, Buresuretto no Ko). Zuzu currently serves as secondary protagonist and Selena as one of the main supporting characters, while Lulu and Rin are currently minor characters seen only in flashbacks.