Allen Kōzuki

Allen Kozuki  (アレン Kōzuki Aren) is a character in the Yu-Gi-Oh! ARC-V anime. He is a friend of Sayaka Sasayama and is a surviving resident of the Xyz Dimension.

Appearance
Allen is a short boy with red spiky hair and bushy eyebrows. His eyes are teal and the front of his bangs are lined with yellow. Allen wears a maroon long-sleeved shirt, grey pants and white boots under a purple poncho that is emblazoned with a blue shield shape and green diamonds; two on the lower part of the shield and two smaller ones on each shoulder.

Personality
Allen is a friendly and light-hearted individual, though not to the point of ignoring suffering. He cares about the well-being of his friends, encouraging Sayaka not to overwork herself and he was saddened to learn of Yuto's disappearance. He is also open-minded and sociable, immediately accepting the Lancers as comrades when Shun brought and introduced them, and speaks with them familiarly.

Past
Prior Academia's invasion, Allen and Sayaka were students from Heartland Duel School's Clover Branch, the same branch where Kaito studied under Yūshō's tutelage who was the teacher of their branch, and the three were close friends. They also befriended Shun, Yūto, and Ruri, students from Spade Branch despite the two branches' rivalry. When Academia attacked, Allen and the others from Clover and Spade branches tried their best to survive, but they eventually overpowered and were forced to be in hiding. Allen revealed that while Academia was invading, Yūshō suddenly vanished, leading him to think that he had abandoned them.

Yūya vs. Kaito
Allen and Sayaka reunited with Shun, who got transported back to Heartland with Yūya, Shingo, and Gongenzaka. The three of them then looked for Yūya and the others and met the refugees that Yūya and the others had saved before who told them their location, arriving in time to stop the Duel between Yūya and Kaito before it was too late. Along with Shun and Sayaka, Allen assured Kaito that Yūya and the others are allies, expressing his gratitude that bringing three new allies was extremely helpful for them. Despite these assurance, Kaito still refused to fight together with them and left the scene.

Resistance Hideout
At their hideout, Allen introduced himself and Sayaka as he told Sayaka, who was distributing food even though it's not her shift, not to overwork herself. He then commented on Yūya's resemblance with Yūto, thinking that he was in fact Yūto himself after he saw him using "Dark Rebellion Xyz Dragon", but Shun cleared this confusion. Allen then revealed that while Yūto and Shun were gone, the Academia had launched a massive offensive attack, nearly wiping out Resistance's Spade and Clover branches, forcing them to be in hiding. Their conversation was cut short when Sayaka questioned Yūya's connection with Yūshō, and the latter revealed that Yūshō is his father. Hearing this, Allen explained that Yūshō was their teacher and had abandoned them during the invasion, shocking Yūya.

Shun vs. Kaito
Allen and Sayaka once again looked for Kaito and found him defeating another group of Academia Duelists. Allen told Kaito to stop being stubborn and return to them, pointing out how much Sayaka worried about him, but Kaito simply ignored them. Shun then interfered and challenged Kaito to Duel. Allen attempted to stop them, but since neither were going to back down, he had no choice but to watch. When Yūya arrived and tried to dissuade them, Allen told Yūya to back down because he was an outsider. When Shun was defeated and Kaito was about to turn him into card, Sayaka tearfully begged him to spear Shun as she remembered how Ruri was kidnapped. Allen told Sayaka that what happened to Ruri wasn't her fault, but Sayaka insisted that it was her fault for being a coward that she couldn't help Ruri. This made Kaito to change his mind and left, sparing Shun.

Duel Against Tyler Sisters
When everyone found out that Sayaka was missing, Allen and the Lancers immediately set off to look for her. He arrived just in time before Academia Duelists, the Tyler Sisters, were about to challenge Sayaka to Duel. He accepted the challenge in Sayaka's place, resolving to protect her. However, Sayaka also decided to join the Duel, not wanting to always be protected. Allen and Sayaka's combination seemingly able to overpower the sisters, but to their shock, the sisters able to counterattack with their Fusion monsters and defeated them.

Deck
Allen uses "Railway" Deck.

Trivia

 * Allen shares the same family name and Deck with Anna Kozuki from Yu-Gi-Oh! ZEXAL.