Sendou Aichi

Japanese name:

先導 アイチ

The main protagonist of the 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. He battles using a Royal Paladin Deck, with his aces being Blaster Blade, King of Knights, Alfred, Soul Saver Dragon, Alfred Early, and Majesty Lord Blaster.

Later in the series, 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, 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. However, Aichi cannot rid himself of his desire to use Psyqualia. He eventually embraces both sides of himself - the part that embraces Psyqualia and the part that rejects it - and symbolically takes up both Blaster Blade and Blaster Dark as his avatars, going on to defeat Ren. After his fight with Ren, Aichi loses his Psyqualia, but he is not disheartened by it at all.

In the second season, his Royal Paladin deck was taken away by Takuto Tatsunagi and was switched to a Gold Paladin deck, with his new key cards being Incandescent Lion, Blond Ezel and White Hare in the Moon's Shadow, Pellinore. There is also an increase of players in the second season who are able to use Psyqualia aside from Ren and Takuto. So it is unclear if Aichi's Psyqualia is really gone or just laying dormant. It's also noted that Aichi's memory of anything related to Psyqualia in the 1st season may have been removed/altered by Takuto as well.

Wikipedia