Selena (or Serena) is a character that appeared in later episodes of Yu-Gi-Oh! Arc-V.
She is a dimensional counterpart to Yuzu Hiragi (Standard Dimension), Ruri Kurosaki (Xyz Dimension), and Rin (Synchro Dimension) from Duel Academy in the Fusion Dimension. Even though she came from the Fusion Diemension, which Leo Akaba is planning to invade other dimensions, she is still chosen as one of the Lancers by Reiji Akaba. According to Leo Akaba, Selena is crucial to his plans and were pursued by the Academia.