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Shark's friendship with Yuma also helped him in handling the "Numbers" cards. When "[[Number 17: Leviathan Dragon]]" came in contact with him, it easily took hold of him.<ref name="ep1" /> However, he was able to fight off the influence of "[[Number 32: Shark Drake]]" because of his bond with Yuma, making him the first known person to be able to resist the influence of the "Numbers" without a special item or power. Despite being able to initially resist the influence, [[Vetrix]] said that it did infect him and it will amplify his darkness caused by his desire to take revenge against [[Quattro]].<ref name="ep33" /> However, after a Duel with Yuma, and seeing his bumbling antics, the darkness had disappeared.<ref name="ep46" />
However, after accepting his fate as a Barian, he adopted his cold personality again, saying that fate drew him and Yuma together to fight against one another. Unable to consider peace as an option despite his friendships with Astral and Yuma, he attacked Earth. He is shown to act ruthless when Dueling, as shown during his Duel with Quattro. Throwing himself fully into his Barian persona, he incited his opponent's anger, wanting to be hated and aiming to make both himself and Quattro forget about his time as "Reginald".<ref name="ep125" /> However, when [[Girag]] appeared to be in danger, Nasch immediately attempted to rescue him, showing he cares for many, if not all of the Barian Emperors (with the obvious exception of Vector).<ref name="ep128">{{episode|Yu-Gi-Oh! ZEXAL|128|ref}}</ref> He even burst into tears at witnessing Dumon's death.<ref name="ep132">{{episode|Yu-Gi-Oh! ZEXAL|132|ref}}</ref>He also express sadness at Mizar's death.
===Abilities===
