Sect Ijuin, Yu-Gi-Oh! Wiki

Sect Ijuin (伊 (い) 集 (じゅう) 院 (いん) 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". In Japanese, last names are said before first names, making him "Ijuin Sect", which contains the term "insect". 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

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