|School||Goha 3rd Elementary|
|Anime debut||Yu-Gi-Oh! SEVENS episode 16: "The Man Who Washes Duels"|
Arai is a skinny boy with black hair and black eyes with small pupils, and sharp teeth he usually conceals behind his mask. He dresses in an abundance of hygienic and protective clothing; a clean white shirt with the sleeves rolled up and white pants, blue protective boots with white brushes strapped to the soles, blue finger-less rubber gloves over white ones, a black apron strapped around him with a blue belt with a white buckle, a white shower cap with a brim, and a black mask over his mouth and nose with the Japanese character for "wash" written on it. He also carries a number of cleaning supplies; three yellow wirebrushes tucked into his belt, a dishcloth tucked into the other side of his belt, and a red squirt gun connected to a disinfectant tank he carries on his back, which is painted with a white circle with a red stripe across the middle.
Arai is a cowardly Duelist with little care for fair play, cheating in his Duels liberally. He arrogantly believes this is one of his strengths, though Neiru Saionji believes otherwise. Arai is a strong believer in the need for cleanliness, both physically and in reputation, claiming that Rush Duels are a stain on Dueling that needs to be erased and commonly using such metaphors in his speech.
Arai has a short temper, getting easily riled up and panicking immediately at the notion of his plans falling through, be they within or outside of Duels. He shows himself to be vengeful, attempting to get revenge on Romin Kirishima for defeating him in a Duel and switching his revenge to Luke after recalling how he foiled his cheating. It is hinted that Arai is somewhat insecure, as he cheats in every one of his Duels, something Luke believes means that Arai has decided he can't win without doing so, and he is shown to be loose-lipped about confidential information when it is insinuated that he would not be important enough to know about it.
Arai commonly says the English word "Wash" at the end of his sentences, or simply repeatedly.
Yuga Ohdo, Romin Kirishima and Gakuto Sogetsu were unable to pay for the meal they had eaten at the A.I. Restaurant, so they were tasked with washing dishes under Arai's supervision until they could work off their debt. Although Arai was aware that they were pursuing the body of Kaizo, he kept this to himself, though when Romin accidentally shattered several dishes, Arai decided to try and defeat them himself, believing that his cheating would ensure his victory and prevent Neiru from having to face them. He offered to forget about their debts if they could defeat him in a Rush Duel, claiming the format was a stain on the image of Dueling. Romin decided to be the one to Duel Arai, and though she brought out her "Prima Guitarna the Shining Superstar" on her first turn, Arai easily weakened it through his cheating to re-use his "White Foam - Bleach Motor", but as he was about to swap one of his Set cards out for the final time Yuga accused him of cheating. Arai angrily denied doing so, pointing out that they couldn't touch his Duel Disk during a match under the Goha Dueling Rules and that it should have detected any cheating. Luke then entered the dishwashing area and used a strange power to deactivate the cheating function, preventing Arai from ending the Duel that turn. Despite the loss of his cheating device, Arai returned "Bleach Motor" to the top of his Deck with "Clean Beret - Mop Colonel" and destroyed "Prima Guitarna". After becoming enraged by Luke's comments, Romin Tribute Summoned "Esperaid the Smashing Superstar" and revived two of her monsters to Arai's field in Defense Position, before granting her two "Romic'n'Rollers" the ability to inflict piercing battle damage, allowing her to destroy all of the monsters on Arai's field and defeat him. Afterwards, Luke interrogated Arai over Kaizo's whereabouts, and despite Arai's attempts to play mum, he accidentally admitted he'd seen Kaizo. Yuga and his friends soon found the door to Neiru's garden and were able to open it, much to Arai's shock, and he frantically apologized to Neiru for his actions. Neiru coldly told Arai that his cheating was not a strength and dismissed him, leaving Arai wailing his master's name outside the closed door.
A few days later, Romin and her friends returned to the A.I. Restaurant to have a meal using coupons that Luke had obtained, and Arai watched them enjoying their meal from the dishwashing room, plotting his revenge. He modified a waiter Drone to splash Romin with water and take her away under the pretense of cleaning it off her, but the Drone brought back Luke instead, who Arai trapped in a cage. Arai was furious that the Drone had kidnapped Luke, the one Duelist who he couldn't cheat against, but after Luke was unable to use his "Luke Devil" power to deactivate the cage, Arai realized Luke couldn't use his power to stop him cheating and released Luke after he challenged him to a Duel while babbling about being turned into a Dueling Superhuman. Although Luke Summoned three Dragon monsters, he voiced a desire to set Arai on the right path, claiming he had set Arai on the wrong one. Denying any such notion, Arai cheated even more brazenly than before, calling it "Arai Angel" in contrast to Luke's "Luke Devil", rearranging the top cards of his Deck to force Luke to draw more cards, then using his "Cleanliness General - Big Tidy" to make Luke discard his hand and draw more cards in an attempt to Deck him out. As he Summoned his second "Big Tidy", Yuga, Romin and Gakuto arrived and tried to use Luke's power to stop Arai from cheating, but they were unable to do so, though Luke simply decided to use skill to beat Arai and flipped his "Big Tidy" face-down with "Dragonic Disorder". Although Arai had failed to Deck Luke out, he was confident that Luke would be unable to defeat him due to the high DEF of "Big Tidy" and the high LP he'd gained from his combo, but to his horror, Luke destroyed all the monsters on his field and then Summoned three high-Level Dragons, defeating Arai. Yuga then asked Arai if he knew where the Gate of Providence was, but Arai refused to tell them until Yuga insinuated that he didn't even know the location, causing Arai to reveal the Gate's location before he realized what he said. Arai was confident that Yuga and his friends wouldn't be able to get back into the Garden from the A.I. Restaurant due to the reinforced door, but Luke' used his power to deactivate the lock, and afterwards Neiru dropped Arai down a trapdoor.
Team Battle Royal
Arai, Schrödinger Nekoyama, and Sebastian were tasked with examining the data of the Goha Rush Duel Team Battle Royal in Neiru's haven to determine who was behind the tournament and the actions of Goha 66 and ordered to report to Neiru if they found anything. However they had little success due to their limited tech skills, but Getta Taira and Ushiro Omaeno arrived to take over due to Getta's hacking skills. As Getta worked, Arai began pointing out sections of the data he had already "washed" until Ushiro distracted him with scary stories. Arai and Ushiro eventually began providing Getta with calories to maintain his workload as Roa called Getta for updates while Yuga and Luke prepared to Duel. As the power began to fail as Getta finally found what he was looking for; someone had been using the Goha Rush Duel Team Battle Royal to hack the Goha Duel Server to uninstall Rush Dueling, and Arai learned over the phone that the server was located on the moon. The Heavy Cavalry Duel Club destroyed Otes' Relic, thought to be responsible for the hack, but Getta confirmed the process couldn't be stopped. Although Rush Dueling was eventually uninstalled after Luke defeated Yuga, Yuga and Neiru were able to reinstall it in the Super Rush Robot.
Goha 6 Siblings
Romin called Arai to Goha 7th Elementary to help wash down Yoshio Atachi, Swirly and the members of Goha 7th's Concert Band Club. Arai hosed the five of them down and Romin congratulated him before he left.
After Mimi was unable to pay for the all-you-can-eat buffet she had treated the Goha 7th and Goha 6th Elementary Student Councils to, she was put to work under Arai to work off her debt. As Arai brought Mimi more and more dishes, she cleaned the trove of plates in an instant, impressing Arai, though to his dismay she'd noticed some of his dishes were dirty and ordered him to wash them again; Arai quickly hurried to comply.
Arai uses a WATER Deck themed around cards with a cleaning and military motif. He uses a cheating mechanism installed in his Duel Disk that allows him to swap his Set Spell or Trap Cards with those he desires, or place specific cards on top of his Deck. In his Duel with Romin Kirishima, he uses "White Foam - Bleach Motor" to reduce the ATK of high-Level monsters and inflict effect damage, while using effects that recycle Spell Cards back into the Deck such as "Clean Beret - Mop Colonel" or "Washing Musketeer Washooter" to activate it multiple times per turn. In his Duel with Luke, he instead uses a Deck out strategy centered around using the effects of "Washing Santa Cloth" and "Cleanliness General - Big Tidy" to force his opponent to repeatedly draw cards in order to drain their Deck.
|Tatsuhisa "Luke" Kamijo||22||Lose|
- Yu-Gi-Oh! SEVENS episode 16: "The Man Who Washes Duels"
- Yu-Gi-Oh! SEVENS episode 22: "The Sealed Devil"
- Yu-Gi-Oh! SEVENS episode 49: "RoaRomin"
- Yu-Gi-Oh! SEVENS episode 50: "Gakuting"
- Yu-Gi-Oh! SEVENS episode 51: "Road vs. Daor"
- Yu-Gi-Oh! SEVENS episode 52: "The Final Rush Duel"
- Yu-Gi-Oh! SEVENS episode 54: "Riding Rush Duel!"
- Yu-Gi-Oh! SEVENS episode 59: "Order Button"