Sect Ijuin Sect Ijuin ( セクト , " Ijūin Sekuto " ) is a character from the " Yu - Gi - Oh ! 5D ' s " manga . He is one of Yusei ' s closest friends from Satellite , but sided with the Skeleton Knight after acquiring the Duel Dragon , " Archfiend Dragon Beelze " . Design . Etymology . In Japanese , last names are said before first names , making him " Ijuin Sect " , which contains the term " insect " . Voice / Mannerisms . In the Japanese version , Sect has a habit of saying ( 「 アリ 」 " ari " , " ant " in Japanese ) . According to an omake ( joke ) from volume 1 , this is because Sect once played an " Ant " Deck . This habit is completely removed in the English version . Appearance . Sect is quite small , having a similar height and appearance to Leo . Sect originally wore a white biker outfit with a blue pattern and a helmet of a similar design . He also wore a pair of goggles on his helmet and a crimson scarf . After siding with the Skeleton Knight , Sect wears black and gold medieval armor and a red cape , similar to that worn by The Supreme King . Sect also has brown hair and blue eyes . After Summon ing " Archfiend Dragon Beelze " his skin began to crack , leaving scars across his face . His skin healed after he Summoned " Archfiend Uber Dragon Beelzeus " for the first time , but his scleras turned black . Sect ' s Duel Runner is in the shape of an ant , referencing his Insect Deck . Sometime after his Duel with Jack Atlas , Sect received a new , more modern Duel Runner with a sleek design . Personality . Sect was originally a fun person , believing that Duels were fun , even when he lost . After acquiring his " Duel Dragon " , he became quite secretive , hiding it from Yusei . He also has a tendency to get into arguments easily , seen when Crow Hogan pushed him aside and getting angry at him ( Crow ) for it , calling him " M - Head , " as a reference to Crow ' s M - shaped criminal mark . After being affected by its Shadow Miasma , Sect ' s personality became dark with him believing that Yusei looks down on him rather than seeing him as a rival . During his Duel with Akiza , Sect mocked her throughout the Duel , especially when she wrongly predicted the turn he ' d lose . Biography . Sect challenges Yusei Fudo to a Turbo Duel , in a Satellite factory , in the hopes of defeating him . Yusei wins , but is impressed by Sect ' s performance and accepts Sect as his rival . After the Duel , Sect climbs up on top of a tank and , following an urban legend , holds two cards up to the sunset . He clasps them together and prays that the Skeleton Knight will give him rare cards to use to beat Yusei . The Skeleton Knight appears , but refuses to give cards to someone this weak . He takes Sect captive and knocks him out . The knight challenges Yusei to a Duel in order to save Sect . During the Duel , Sect wakes - up and starts cheering for Yusei . Yusei takes Sect on the back of his Duel Runner to bring him to the hospital . However , Yusei is forced into a Turbo Duel with Jack Atlas on the way . During the Duel , Sect falls off Yusei ' s Duel Runner . Yusei abandons the Duel to save him and both of them fall into a body of water . Yusei manages to get Sect to Puzzle Hospital , where he is treated for a minor concussion . While Sect is in the hospital , the Skeleton Knight appears to him in a dream . According to the ancient edicts , the knight says that he shall grant Sect ' s wish . Sect wakes up , frightened , but finds himself holding a card . Sect arrived at the stadium of the D1 Grand Prix , wearing a poncho , shortly after Yusei started his Duel with Greiger . Sect urged Yusei to show everyone the outcome of his special training . Akiza Izinski approached Sect over this and asked if he was with Yusei . Sect was shy at first , wondering if Yusei knew this pretty lady . He acted tough and said that he is Yusei ' s rival . He was shocked when Akiza correctly guessed that Yusei ' s new training meant he had developed a new Sense . During Yusei ' s Turbo Duel with Hunter Pace , Sect overhears some of Hunter ' s goons joking about them taking Yusei ' s turbo chip out of his Duel Runner so Hunter could win the race by overtaking Yusei . As this happened , Sect began to pick a fight with the goons and when they thought they were getting the upper hand , his " Archfiend Dragon Beelze " began to infect him with pure darkness that gave him enough strength to defeat Hunter ' s three goons . After this , he disappears without a trace . After hearing about these events , Yusei began to look for him throughout the city , as Sector Security were looking for him in order to place him under arrest . Lazar observed these events and informed Rex Goodwin that Sect has a shadow card . Overhearing their conversation , Jack Atlas walked out and began to look for Sect , claiming that he wanted his shadow card . After these events , Sect rode to the harbor on his Duel Runner , trying to escape from all of the attention his fight had brought up , only to be cornered by Jack , who challenged him to a Turbo Duel . Suddenly , the shadow card began to infect Sect again , and both prepared for a Duel of darkness . During the Duel , Yusei Fudo drives in between him and Jack , causing Sect to snap out of his dark manner for a short while . However , after Summoning " Beelze " , he begins to think that Yusei is looking down upon him and making fun of him because he was weak . As the Duel progresses , Sect becomes more and more consumed by the shadow card , even to the extent of having his skin begin to flake off , showing that the shadow card carries some form of curse . During the Duel , Jack gains a massive upper hand by Summoning " The King of Divine Punishment , Dark Highlander " , but shortly after this happens , the Skeleton Knight appears and takes Sect with him , ending the Duel and leaving Jack and Yusei shocked at what just happened . Later , as the second stage of the D1GP takes place , Sect Duels Akiza under the Skeleton Knight ' s orders . After winning against Akiza , Sect takes her with him into the Aerial Fortress Sebial . And is currently waiting in the center of the fortress according to the Skeleton Knight . After Sect senses that the duels in the northern and southern corridors are over , he wonders who will be his opponent . Heading down to the Watchtower of Sky ' s Lock , he discovers Yusei and Jack there . Dueling against Yusei , he reveals to him that every time Yusei loses life points , Akiza will get hurt in the process . After Yusei manages to destroy his Duel Dragon , Sect returns to normal . However the Ultimate God begins to awaken but Sect reveals a way to stop it and tells Yusei about the Light Sense . Working together with Yusei , he and Sect use the " Cross Sense Final Session " and seal away the Ultimate God . Afterwards , Rex Goodwin appears and reveals his plan to resurrect the Ultimate God . Sect protests that they sealed it away but Goodwin informs him that he has the God ' s Shadow Miasma within him . After Goodwin absorbs the remaining miasma from the Ultimate God he proceeds to absorb the energy and cards from all the duelists in the area including Sect himself . When Sect learns that Yusei is the only one that can duel Goodwin he is confident that Yusei will find a way to win . Relationships . Yusei Fudo . Sect originally saw Yusei as an older brother figure , occasionally calling him " aniki " ( big brother in Japanese ) . He believes that Yusei is an awesome Duelist who deserves to win all . After Sect became an ally of the Skeleton Knight , his once friendly outlook on Yusei turned sour , as he now believes that Yusei looks down on him as a weak Duelist . Skeleton Knight . When Sect wished for cards from the Skeleton Knight , his wish was granted and the Skeleton Knight gave him the powerful , dark card , " Archfiend Dragon Beelze " . But this power came at a hefty price : Sect ' s soul . It is due to this that Sect is now a member of the Skeleton Knight ' s Crusade , a dark and powerful organization consisting of several Duelists who wished for cards from the Skeleton Knight . All of them seek to destroy the Signers . Sect sees the Skeleton Knight as a powerful figure , maybe even father - like , as he rescued Sect from his Duel with Jack before he lost . Decks . Insect / Hell Deck . Sect uses an Insect Deck . After siding with the Skeleton Knight , he begins to incorporate the " Hell " archetype , also using several cards which reference " Death " such as " Fruit of the Dead " . He also uses various methods to swarm Synchro Material Monster s so he can Synchro Summon " Archfiend Dragon Beelze " with ease through cards such as " Call of the Haunted " and " Hell Summon " . Ant Deck . An omake in volume 1 revealed Sect originally played an " Ant Deck " . However , he later changed it to a general Insect Deck because ants make weak enemies . His ace monster was " Hammerhead Ant " .