Yuuto's got this uncanny resemblance to Yuya Sakaki—seriously, people constantly mix them up. When Zuzu first ran into him, she genuinely thought he was Yuya dressed up. Their faces are basically identical, which becomes a whole thing plot-wise. Before his real identity got revealed, he was just "Unknown" on the screen, though fans and promo materials called him the Dark Duelist (or the Dark Masked Duelist, depending on who was talking about him). The mystery around who he actually was played into that whole mysterious vibe he had early on.
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