Nash

Nasch is one of the Seven Barian Emperors appearing in Yu-Gi-Oh! ZEXAL anime. Before his death, he was the leader of the Seven Barian Emperors. Reginald Kastle was originally Nasch as he was called that in his past life.

Appearance
Though only seen in silhouette, the top part of his head remains visible enough to make out what appears to be a hair style similar to that of Reginald Kastle's. The front part resembles six tentacles (three on each side) that hang downwards, and what appears to be a emblem in the middle.

As leader of the Seven Barian Emperors, Nasch possessed the original Barian Emblem as seen in the artwork of "Rank-Up-Magic Barian's Force", which could mean that emblem was also originally belonged to him.

Etymology
His name is derived from Eta Ursae Majoris, also known as Benetnasch.

History
In his past life, Nasch lived his life as a human until he died, and an unknown number of years later, he was reborn as a Barian, with no memory of his previous life. He joined up with several other humans who had also reincarnated as Barians as the Seven Barian Emperors, plotting with them to destroy the Astral World while acting as their leader. At some point, Nasch and Merag were murdered by their fellow Emperor Vector, resulting in Dumon inheriting control of the group and believing the two had simply vanished.

Legendary Number War
Later during Shark's Duel with Abyss, Dumon and Astral saw Shark's past life, leading Dumon to suspect that Shark and Rio were Nasch and Merag, respectively. Later, when Shark visited his sister, Rio at the hospital, Dumon appeared and called Shark "Nasch", urging him to "awaken". Dumon showed a Barian Emblem to Shark and told him he was not Reginald Kastle/Shark, but Nasch, the leader of the Seven Barian Emperors. The emblem glowed and Shark, Rio and Dumon were teleported at the Number ruins. Dumon, in his true form, requested Shark to regain his past life's memories. Shark touched the emblem, which started glowing again, and Shark was in his past life memories again. In there, when he was at Rio's funeral, he called himself Nasch. Dumon and Vector in their past lives also called him Nasch. When the legend was about to end, Dumon told Shark that he should understand that why he was reincarnated as the leader of Seven Barian Emperors. Shark calls himself a Barian, crying that destiny could be cruel, too.