The young champion player of Battle Spirits TCG.  As Bashin plays the game with passion, J plays his deck with the power of reason and logic.

J seems to have a cold and aloof personality at first glance. Though he has trouble getting along with others, to those close to him, he's quite protective, especially to his sister, Kyouka. He also tries to be funny, making up gags.

(Source: Battle Spirits Wiki)

Meet Toppa Bassin, a hero sixth-grader's favorite trading card. Bassin Kadobatora got a special ability. The legend is a rumor at school Reakado X. Bassin actually know that there are rivals with the pyroxene in the same way, the X over the Reakado, intense card battle we protest. Stocked all the time Reakado X, say the battle to achieve the strongest and legendary champion. The ultimate battle and win the world champion's best put to everyone.
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(Source: Anime News Network)

J Sawaragi