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"Aichi Sendou" is the main protagonist of Cardfight!! Vanguard anime and manga. He is also the main protagonist of Cardfight!! Vanguard Movie: Neon Messiah, along with Toshiki Kai. For the duration of season 4, Aichi was sealed by his own volition to keep Link Joker sealed away with him, while leaving his friends in the dark. Consequently, Kai set out to find Aichi and becomes the main protagonist during this period, although the spotlight is still on him. As a result of playing host to the Void's seed, Aichi himself ends up becoming the main antagonist in Kai's quest to bring him back. In Cardfight!! Vanguard G, Aichi is studying abroad in America and is recruited by Ibuki to help with Plan G. Because of his absence, Team Q4 is forced to fight Team TRY3 in the G Quest's Ultimate stage without him. He also sends his Stride Force to Chrono Shindou during his fight against Ryuzu. In Cardfight!! Vanguard G: NEXT, he comes back to Japan during summer break and goes to meet Kouji Ibuki with Chrono.
He is a somewhat shy and timid young man who wishes to be a Vanguard Fighter, but has never had the chance to have a real fight until his second encounter with Kai. When starting to play Vanguard, he believes more in himself, becoming a powerful Vanguard Fighter. His Vanguard Circle's color is blue; but when using a Shadow Paladin deck, the color changes to dark blue.