{{Rio kastle, also known as Marin, is the twin sister of Reginald "Shark" Kastle or Nash. She is confident, adamant, loyal, and caring. She is very confident in sports. Somewhat childish. Ailurophobic. Annoyed when people refer to her as Shark's sister instead of her name. Pride in her abilities/effort. Hates when people underestimate her. as a barian she is cold, a little caring, and protective over her brother. annoyed easily. She doesn't like being called by her human name, Rio due to her wanting to forget her past.}} {{Marin or also known as Rio is 14 years old, and has dark pink eyes and like her brother, Reginald "Shark" Kastle. She has pale skin and dark blue hair with light blue bangs. Marin also wears a ring on her right little finger, which was previously owned by her brother. Marin's appearance attracts many initial admirers.}} {{Her attire includes a white jacket over a light pink shirt, black stockings, white skirt and shoes. The left coattail of her jacket has a conch-like ornament hanging down. At school, she wears the standard Heartland Academy uniform, with hers being green due to her status as a second year student. She wears longer stockings than most female students. During a trip to Spartan City, she bought a casual outfit composed of a blue-white striped sleeveless T-shirt, a blue upper knee length skirt and white high-heeled sandals.}} {{As the Barian Marin, her skin is chalk-white and her hair is longer with more volume and is purely dark blue instead of dual-coloured. She wears a white dress with blue and gold pieces, with large white shoulder pauldrons and gloves, with a blue midriff and a miniaturized version of Nash's Barian Emblem on her chest. She still has her pink eyes. She also has red marks on each side of her cheeks, a jeweled diadem with a gold net over the back of her hair that is adorned with green and red jewels that also has a green teardrop jewel hanging over her face.}} Despite her appearance and previously spending a large amount of time in hospital, she is a confident and adamant person, getting annoyed when things do not go her way. This is usually shown when conversing with her brother. Her confident personality assists in her interests which allows her to conquer sports such as soccer, baseball, basketball and boxing with ease. Despite all of this, Rio also shows somewhat of a childish side as well, shown by her fear of cats (this showing she has ailurophobia) and calling Shark a "meanie" when he teasingly refused to help remove one from her sight. Rio tends to be annoyed when people refer to her as "Shark's sister" instead of calling her by name as indicated by Yuma due to her snapping at him when he continually calls her as such, and especially does not like it when someone insults her brother. This is further seen many times during her Duel against Lotus as she got mad at her for making a rude remark about Shark. Despite being occasionally irritated with Yuma for not addressing her properly as "Rio", his personality and playful antics makes her let it slide given that she is thankful to him for helping her brother and being his friend. It is also revealed that she goes very far on things and acts strong because she feels she has to or people may use her as a shield against her brother. She later shows admiration towards Yuma and Alito as she commented they have amazing Dueling spirit. She takes great pride in her abilities and effort as she has no problem in showing them when people underestimate her as she believes women are not to be viewed as "pretty decorations". Rio also has a empathetic quality to her personality as well. This is demonstrated when she finds Bronk injured on the way to school, and shows genuine concern to him and helps treat his injuries. As a Barian, Rio possesses the ability to sense other Barians. This is shown when Girag arrived on Earth, which caused her great pain and she foretold that "they" were coming to take "the most important thing". When Mizar arrived later, Rio went into a trance-like state and again said that someone was coming to destroy "the most important thing" and then describing a dragon of ill omen that would destroy everything. She once more senses the presence of the Barians, and reports that they are attacking Yuma. During those moments, Rio enters some sort of trance while a mysterious red or green aura appears around her. After boarding the Different Dimension Airship, Rio was able to see Astral. She expressed surprise that she could then still do so after leaving the airship. Like other Barians, Rio possesses the ability to Barian Battlemorph. Known as Marin, she was once the priestess as well as the princess of the United Lands of the Poseidon Ocean alongside her brother, Nash. One day, the kingdom was attacked by Vector, who led a fleet of ships and several "Gorgonic Guardians" to lay waste to it and loot it.[18] After Nash led the kingdoms forces to defeat the "Gorgonic Guardians" with mirror shields, Vector performed a blood sacrifice to the ocean god, Abyss, turning the battle back into his favor. Marin rode up to Abyss and was grabbed. She offered herself as a sacrifice, plunging into the ocean depths to revive another god.[19] This action was due to Don Thousand hypnotizing her. As she owned a card called "Number 94: Crystalzero", Thousand influenced her death to aide in his own revival.[20] Rio and her twin brother Reginald lived in a mansion with their parents. One night, Reginald was chasing Rio around the house after she stole his Deck of Duel Monsters cards that his father gave him. Their fighting resulted in a suit of armor nearly falling on Rio, but Reginald pushed her out of the way, earning a scar on his right shoulder.[1] One night, Reginald and his family were traveling in a car, which was hit by a truck driven by Chironex, who was fleeing from the police. All four were hospitalized. All four members of the family died in the hospital. Just after their deaths, the souls of the Barians Nash and Marin were transferred into Reginald and Rio, respectively. This was done by Abyss, after Nash and Marin were killed by Vector. This revived the bodies of both siblings, but stripped Nash and Marin of their memories. Thus, Nash and Marin continued living as Reginald and Rio, with the doctors expressing shock that they were suddenly breathing again. An unknown number of years later, Don Thousand reincarnated both her and her brother as two of the Seven Barian Emperors, as their souls were each connected to a Mythyrian "Number" card, which had sealed Thousand's power.[21] The two became the leaders of the Seven Barian Emperors. Vector had also been reborn as a Barian Emperor and often clashed with Nash's leadership. After Nash had annoyed him enough to score 100,000,000 points on his self-made point system, Vector took Marin hostage. When Nash intervened, Vector used "Giant Sky Sword" to freeze Nash's body and force both of them to jump off a cliff.[22] Vector believed them dead[19], while Dumon believed they had vanished and assumed leadership of the group from them in the interim.[23] The two were rescued by Abyss, who informed them that he would send them to Earth, where their souls would find new bodies to inhabit. The process would eliminate their memories though until they reunited with Abyss again. Their souls were transferred to the bodies of Reginald and Rio Kastle, who had recently died in a car accident. {{Marin once Dueled Quattro who was operating under the orders of Vetrix. He played the Spell Card, "Flaming Hell Blessing", which set the surrounding area on fire. She was critically injured in the blaze, though Quattro carried her to safety, his face being scarred in the process. Marin was hospitalized for months before finally recovering after she was almost kidnapped by Art Stanley. Art Stanley was beaten in a duel by Shark and thus Marin was saved.}} {{Marin used to be a member of the Seven Barian Emperors. The Barians being a race of aliens who were at war with the Astral World. Due to her loyalty to Shark, who was also the Barian Emperor Nash at the time, sided with the Barian World. She was absorbed by Vector after losing a Duel to him, but was later revived after Yuma and Astral's Duel. She and her brother has since then become normal humans, continuing to live their lives as normal. Marin now serves on the student council at Heartland Academy.}} {{Marin uses an Ice Winged Beast Deck, primarily focused on Xyz Summoning "Ice Beast Zerofyne" and later her "Number 103: Ragnazero". Marin uses several cards to inflict large amounts of effect damage such as "Blizzard Falcon" and "Diamond Dust". Marin also uses cards like "Ice Fire Egg" to give her access to Ranks she cannot normally access, letting her Xyz Summon "Ice Princess Zereort". She later gains the ability to perform a Chaos Draw, giving her access to "Rank-Up-Magic - The Seventh One" to easily Special Summon her "Number C103: Ragnafinity" which she uses in combination with "Distortion Crystal" and "Zero Blade" to severely damage her opponent.}} {{Dumon is shown to be the most level-headed among them and was at one time their leader. He is shown to care about his fellow Barians greatly, often voicing his high opinion of them and usually letting them know that he has faith in them before seeing them off on their mission. Dumon is very loyal to the Barian World and prioritizes its safety above all else. Likewise, he is extremely loyal to the original leader of the Barian World, Nash, going to great lengths to find and restore him to his original position within the Seven Barian Emperors. This appears to have stemmed from their previous human lives.}} Dumon appears most often under his gray cloak and has grey eyes that glows red. In his Barian form, his skin is of a wisteria color, he has short gray hair, two blue markings on the sides of his face and silver armor plating with blue gems covering different parts of his body, with a Barian Emblem found on the right side of his chest. Unlike most Barians, he has a visible nose in his true form and his eyes are completely gray, with no visible pupils. When on Earth, his appearance is that of a bespectacled boy with short, gray spiky hair, wearing a black vest over a white shirt, black pants, a Baria Crystal on his right wrist and a scarf tied around his neck. He would also come to use his former comrade's name, Nash, as his alias when in human form.[2] Following his revival after Yuma Tsukumo and Astral's ceremonial Duel, Dumon attends Heartland Academy as a third-year student, thus wearing the standard blue-lined uniform, blue pants and brown shoes. In in his previous life, Dumon was a legendary knight and accordingly wore silver armor with a white cape. Unlike the human form that he took on in present-day Earth, Dumon did not wear spectacles. Dumon, like the other Barians, has been shown to teleport using portals. Dumon has also been shown to generate a large energy ball which he can use to fly. Dumon is one of the few Barians who can stay in his true form, even on Earth (though he was in close proximity to Number ruins at the time). The only exception is when his Baria Lapis is damaged. Dumon uses a "Star Seraph" Deck, focused around quickly summoning his ace monster, "Number 102: Star Seraph Sentry" through cards such as "Star Seraph Sage" and "Star Seraph Scout". He later gains the ability to perform a Chaos Draw to use "Rank-Up-Magic - The Seventh One", allowing him to Rank-Up "Star Seraph Sentry" from either his Graveyard or Extra Deck and Summon its evolved form. He mostly uses light monsters and fairies despite being a barian which is ironic.