This is a list of characters that are within the Cardfight!! Vanguard media franchise.
Birthday: June 6 Gemini Blood B The main protagonist of the original "Cardfight!! Vanguard" series. When he was younger, Aichi was a very shy and lonely boy who is 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.
Later in the first season, Aichi awakens the power of Psyqualia, a rare psychic ability that gives him the power of precognition during Vanguard battles. However, using Psyqualia corrodes the user's personality, turning Aichi into a cold-blooded, overconfident opponent. Under the manipulation of Ren Suzugamori, a fellow Psyqualia user, Aichi embraces Psyqualia to gain the strength he believes he needs to surpass Kai. Symbolic of this, he abandons his Royal Paladin deck in exchange for a Shadow Paladin Deck and begins to use Kai's "Final Turn" catchphrase when he foresees victory.
Aichi is convinced to abandon Psyqualia after a match with Kai, in which he realizes his true wish of fighting Kai on equal terms without reliance on a supernatural advantage. He also regains his Royal Paladin deck. However, Aichi cannot completely rid himself of his desire to use Psyqualia. He eventually embraces both the light and dark sides of himself - the part that embraces Psyqualia and the part that rejects it - and goes on to defeat Ren, also ridding him of Psyqualia in the process. After his fight with Ren, Aichi loses his Psyqualia, but he is not disheartened by it at all.
In the second season, Aichi's Royal Paladin deck was taken away and replaced with a Gold Paladin deck. His Psyqualia also reawakens in the middle of the second season but no longer lets himself be overcome by its influence. His truimp card in the second season is "Incandescent Lion, Blond Ezel", given to him by Kourin. In the third season, Aichi graduates from Hitsue Junior High and enters high school as a freshman at Miyaji Academy. Aichi starts a club called the Cardfight Club in the hopes of getting more students to play Vanguard. He also becomes the captain for said club. Aichi has a new deck which features the return of some of his signature Royal Paladin units re-imagined as Gold Paladins. He starts to have more challenges as the Miyaji Student Council relentlessly tries to abolish the Cardfight Club.
In the fourth season, Aichi mysteriously disappears from the world, and no one except for Kai and eventually a few of his friends, remember him. He willingly sealed himself in a sanctuary where the Quatre Knights resided and guarded him. It is later revealed that his reason for his confinement was to contain the seed of Link Joker, which was implanted in him soon after defeating Reversed Takuto. Eventually, Kai gets Aichi to see the error of his ways, destroys the seed into tiny benign shards, and brings him back.