カードファイト!! ヴァンガード
The main protagonist of the original "Cardfight!! Vanguard" series. When he was younger, Aichi was a very shy and lonely boy who was frequently bullied at school. After receiving the rare card "Blaster Blade" from Toshiki Kai one day, he begins to come out of his shell. He eventually meets Kai once more and is persuaded to become a Vanguard player, slowly learning the rules and improving his skills as the series progresses. In the first season, Aichi uses a Royal Paladin deck.