![the reggy woods trio the reggy woods trio](https://gp1.wac.edgecastcdn.net/802892/http_public_production/artists/images/1903239/original/crop:x0y0w2048h2048/hash:1489522217/1479581289430.jpg)
He also wears two grey rings on his right hand, but he later gives one to Rio. He also has a scar on his right shoulder. His accessories include a grey, shark tooth-shaped locket, which contains a family photo of his parents, as well as himself and his sister Rio Kastle as children. He also has a blue-gray "crown" in front of his forehead. These "tentacles" slightly resemble pigtails, but curl up on the end.
![the reggy woods trio the reggy woods trio](https://i.ebayimg.com/images/g/q8kAAOSweIlb1YBv/s-l300.jpg)
Shark has dark blue eyes, pale skin, and dark purple hair, which resembles tentacles hanging down, referencing his Deck theme of aquatic creatures. 2.2.2 World Duel Carnival Preliminaries.He later vanished after losing to Yuma in a Duel that had the Human, Astral, and Barian Worlds at stake, but was revived along with the rest of the Barian Emperors by the Numeron Code. He is the only Barian Emperor not to be absorbed by Don Thousand, as well as the only Barian whose original memories were not altered. Determined to not let tragedies befall his people again, he betrayed Yuma and his friends to safeguard the Barian World. He is later revealed to be Nash ( Nasch (ナッシュ, Nasshu) in the Japanese version), the leader of the Seven Barian Emperors.
![the reggy woods trio the reggy woods trio](https://4.bp.blogspot.com/-cPBt5rmPGAs/WPd6U9hJbDI/AAAAAAACMAg/270fWByVB4cT8eYn0qOLQM7HWzf1G5bIACLcB/s1600/FSTOPdtlajzLR-18.jpg)
He was originally an arrogant and callous person, but has grown quite humble. He is one of Yuma Tsukumo's close friends and rivals. Reginald Kastle, known as Ryouga Kamishiro ( 神 ( かみ ) 代 ( しろ ) 凌 ( りょう ) 牙 ( が ), Kamishiro Ryōga) in the manga and Japanese version and nicknamed "Shark" (シャーク, Shāku) in all versions, is one of the main characters and the final antagonist in Yu-Gi-Oh! ZEXAL other than the unseen threat to Astral World.