Leo Akaba[6] or Reo Akaba, also commonly known as the Professor, is a character in the Yu-Gi-Oh! ARC-V anime, the father of Ray, and then later husband of Henrietta and father of Declan, though he abandoned his second family before the adoption of Riley. Originally a resident of the Original Dimension, he is responsible for masterminding the Duel Academy's attacks on the Xyz Dimension to complete the Arc Area Project and Revival Zero. Due to his position and machinations, he is the primary antagonist of the series.

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